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The periodic table, elements being denoted by their symbols

Chemical symbols are the abbreviations used in chemistry, mainly for chemical elements; but also for functional groups, chemical compounds, and other entities. Element symbols for chemical elements, also known as atomic symbols, normally consist of one or two letters from the Latin alphabet and are written with the first letter capitalised.

History

Earlier symbols for chemical elements stem from classical Latin and Greek vocabulary. For some elements, this is because the material was known in ancient times, while for others, the name is a more recent invention. For example, Pb is the symbol for lead (plumbum in Latin); Hg is the symbol for mercury (hydrargyrum in Greek); and He is the symbol for helium (a Neo-Latin name) because helium was not known in ancient Roman times. Some symbols come from other sources, like W for tungsten (Wolfram in German) which was not known in Roman times.

A three-letter temporary symbol may be assigned to a newly synthesized (or not yet synthesized) element. For example, "Uno" was the temporary symbol for hassium (element 108) which had the temporary name of unniloctium, based on the digits of its atomic number. There are also some historical symbols that are no longer officially used.

Extension of the symbol

Annotated example of an atomic symbol

In addition to the letters for the element itself, additional details may be added to the symbol as superscripts or subscripts a particular isotope, ionization, or oxidation state, or other atomic detail. A few isotopes have their own specific symbols rather than just an isotopic detail added to their element symbol.

Attached subscripts or superscripts specifying a nuclide or molecule have the following meanings and positions:

  • The nucleon number (mass number) is shown in the left superscript position (e.g., N). This number defines the specific isotope. Various letters, such as "m" and "f" may also be used here to indicate a nuclear isomer (e.g., Tc). Alternately, the number here can represent a specific spin state (e.g., O2). These details can be omitted if not relevant in a certain context.
  • The proton number (atomic number) may be indicated in the left subscript position (e.g., 64Gd). The atomic number is redundant to the chemical element, but is sometimes used to emphasize the change of numbers of nucleons in a nuclear reaction.
  • If necessary, a state of ionization or an excited state may be indicated in the right superscript position (e.g., state of ionization Ca).
  • The number of atoms of an element in a molecule or chemical compound is shown in the right subscript position (e.g., N2 or Fe2O3). If this number is one, it is normally omitted - the number one is implicitly understood if unspecified.
  • A radical is indicated by a dot on the right side (e.g., Cl for a neutral chlorine atom). This is often omitted unless relevant to a certain context because it is already deducible from the charge and atomic number, as generally true for nonbonded valence electrons in skeletal structures.

Many functional groups also have their own chemical symbol, e.g. Ph for the phenyl group, and Me for the methyl group.

A list of current, dated, as well as proposed and historical signs and symbols is included here with its signification. Also given is each element's atomic number, atomic weight, or the atomic mass of the most stable isotope, group and period numbers on the periodic table, and etymology of the symbol.

Symbols for chemical elements

List of chemical elements
Z Symbol Name Origin of name
1 H Hydrogen Greek elements hydro- and -gen, meaning 'water-forming'
2 He Helium Greek hḗlios, 'sun'
3 Li Lithium Greek líthos, 'stone'
4 Be Beryllium beryl, a mineral (ultimately from the name of Belur in southern India)
5 B Boron borax, a mineral (from Arabic bawraq)
6 C Carbon Latin carbo, 'coal'
7 N Nitrogen Greek nítron and -gen, meaning 'niter-forming'
8 O Oxygen Greek oxy- and -gen, meaning 'acid-forming'
9 F Fluorine Latin fluere, 'to flow'
10 Ne Neon Greek néon, 'new'
11 Na Sodium English soda (the symbol Na is derived from Neo-Latin natrium, coined from German Natron, 'natron')
12 Mg Magnesium Magnesia, a district of Eastern Thessaly in Greece
13 Al Aluminium alumina, from Latin alumen (gen. alumni), 'bitter salt, alum'
14 Si Silicon Latin silex, 'flint' (originally silicium)
15 P Phosphorus Greek phōsphóros, 'light-bearing'
16 S Sulfur Latin sulphur, 'brimstone'
17 Cl Chlorine Greek chlōrós, 'greenish yellow'
18 Ar Argon Greek argós, 'idle' (because of its inertness)
19 K Potassium Neo-Latin potassa, 'potash' (the symbol K is derived from Latin kalium)
20 Ca Calcium Latin calx, 'lime'
21 Sc Scandium Latin Scandia, 'Scandinavia'
22 Ti Titanium Titans, the sons of the Earth goddess of Greek mythology
23 V Vanadium Vanadis, an Old Norse name for the Scandinavian goddess Freyja
24 Cr Chromium Greek chróma, 'colour'
25 Mn Manganese corrupted from magnesia negra; see Magnesium
26 Fe Iron English word (the symbol Fe is derived from Latin ferrum)
27 Co Cobalt German Kobold, 'goblin'
28 Ni Nickel Nickel, a mischievous sprite of German miner mythology
29 Cu Copper English word, from Latin cuprum, from Ancient Greek Kýpros 'Cyprus'
30 Zn Zinc Most likely from German Zinke, 'prong' or 'tooth', though some suggest Persian sang, 'stone'
31 Ga Gallium Latin Gallia, 'France'
32 Ge Germanium Latin Germania, 'Germany'
33 As Arsenic French arsenic, from Greek arsenikón 'yellow arsenic' (influenced by arsenikós, 'masculine' or 'virile'), from a West Asian wanderword ultimately from Old Iranian *zarniya-ka, 'golden'
34 Se Selenium Greek selḗnē, 'moon'
35 Br Bromine Greek brômos, 'stench'
36 Kr Krypton Greek kryptós, 'hidden'
37 Rb Rubidium Latin rubidus, 'deep red'
38 Sr Strontium Strontian, a village in Scotland
39 Y Yttrium Ytterby, a village in Sweden
40 Zr Zirconium zircon, a mineral
41 Nb Niobium Niobe, daughter of king Tantalus from Greek mythology
42 Mo Molybdenum Greek molýbdaina, 'piece of lead', from mólybdos, 'lead'
43 Tc Technetium Greek tekhnētós, 'artificial'
44 Ru Ruthenium Neo-Latin Ruthenia, 'Russia'
45 Rh Rhodium Greek rhodóeis, 'rose-coloured', from rhódon, 'rose'
46 Pd Palladium the asteroid Pallas, considered a planet at the time
47 Ag Silver English word (The symbol derives from Latin argentum)
48 Cd Cadmium Neo-Latin cadmia, from King Kadmos
49 In Indium Latin indicum, 'indigo' (colour found in its spectrum)
50 Sn Tin English word (The symbol derives from Latin stannum)
51 Sb Antimony Latin antimonium, the origin of which is uncertain: folk etymologies suggest it is derived from Greek antí ('against') + mónos ('alone'), or Old French anti-moine, 'Monk's bane', but it could plausibly be from or related to Arabic ʾiṯmid, 'antimony', reformatted as a Latin word. (The symbol derives from Latin stibium 'stibnite'.)
52 Te Tellurium Latin tellus, 'the ground, earth'
53 I Iodine French iode, from Greek ioeidḗs, 'violet'
54 Xe Xenon Greek xénon, neuter form of xénos 'strange'
55 Cs Caesium Latin caesius, 'sky-blue'
56 Ba Barium Greek barýs, 'heavy'
57 La Lanthanum Greek lanthánein, 'to lie hidden'
58 Ce Cerium the dwarf planet Ceres, considered a planet at the time
59 Pr Praseodymium Greek prásios dídymos, 'green twin'
60 Nd Neodymium Greek néos dídymos, 'new twin'
61 Pm Promethium Prometheus of Greek mythology
62 Sm Samarium samarskite, a mineral named after Colonel Vasili Samarsky-Bykhovets, Russian mine official
63 Eu Europium Europe
64 Gd Gadolinium gadolinite, a mineral named after Johan Gadolin, Finnish chemist, physicist and mineralogist
65 Tb Terbium Ytterby, a village in Sweden
66 Dy Dysprosium Greek dysprósitos, 'hard to get'
67 Ho Holmium Neo-Latin Holmia, 'Stockholm'
68 Er Erbium Ytterby, a village in Sweden
69 Tm Thulium Thule, the ancient name for an unclear northern location
70 Yb Ytterbium Ytterby, a village in Sweden
71 Lu Lutetium Latin Lutetia, 'Paris'
72 Hf Hafnium Neo-Latin Hafnia, 'Copenhagen' (from Danish havn)
73 Ta Tantalum King Tantalus, father of Niobe from Greek mythology
74 W Tungsten Swedish tung sten, 'heavy stone' (The symbol is from wolfram, the old name of the tungsten mineral wolframite)
75 Re Rhenium Latin Rhenus, 'the Rhine'
76 Os Osmium Greek osmḗ, 'smell'
77 Ir Iridium Iris, the Greek goddess of the rainbow
78 Pt Platinum Spanish platina, 'little silver', from plata 'silver'
79 Au Gold English word (The symbol derives from Latin aurum)
80 Hg Mercury Mercury, Roman god of commerce, communication, and luck, known for his speed and mobility (The symbol is from the element's Latin name hydrargyrum, derived from Greek hydrárgyros, 'water-silver')
81 Tl Thallium Greek thallós, 'green shoot or twig'
82 Pb Lead English word (The symbol derives from Latin plumbum)
83 Bi Bismuth German Wismut, from weiß Masse 'white mass', unless from Arabic
84 Po Polonium Latin Polonia, 'Poland' (the home country of Marie Curie)
85 At Astatine Greek ástatos, 'unstable'
86 Rn Radon radium
87 Fr Francium France
88 Ra Radium French radium, from Latin radius, 'ray'
89 Ac Actinium Greek aktís, 'ray'
90 Th Thorium Thor, the Scandinavian god of thunder
91 Pa Protactinium proto- (from Greek prôtos, 'first, before') + actinium, which is produced through the radioactive decay of protactinium
92 U Uranium Uranus, the seventh planet in the Solar System
93 Np Neptunium Neptune, the eighth planet in the Solar System
94 Pu Plutonium the dwarf planet Pluto, considered the ninth planet in the Solar System at the time
95 Am Americium The Americas, as the element was first synthesised on the continent, by analogy with europium
96 Cm Curium Pierre Curie and Marie Curie, French physicists and chemists
97 Bk Berkelium Berkeley, California, where the element was first synthesised, by analogy with terbium
98 Cf Californium California, where the element was first synthesised
99 Es Einsteinium Albert Einstein, German physicist
100 Fm Fermium Enrico Fermi, Italian physicist
101 Md Mendelevium Dmitri Mendeleev, Russian chemist and inventor who proposed the periodic table
102 No Nobelium Alfred Nobel, Swedish chemist and engineer
103 Lr Lawrencium Ernest O. Lawrence, American physicist
104 Rf Rutherfordium Ernest Rutherford, New Zealand chemist and physicist
105 Db Dubnium Dubna, Russia, where the Joint Institute for Nuclear Research is located
106 Sg Seaborgium Glenn T. Seaborg, American chemist
107 Bh Bohrium Niels Bohr, Danish physicist
108 Hs Hassium Neo-Latin Hassia, 'Hesse' (a state in Germany)
109 Mt Meitnerium Lise Meitner, Austrian physicist
110 Ds Darmstadtium Darmstadt, Germany, where the element was first synthesised
111 Rg Roentgenium Wilhelm Conrad Röntgen, German physicist
112 Cn Copernicium Nicolaus Copernicus, Polish astronomer
113 Nh Nihonium Japanese Nihon, 'Japan' (where the element was first synthesised)
114 Fl Flerovium Flerov Laboratory of Nuclear Reactions, part of JINR, where the element was synthesised; itself named after Georgy Flyorov, Russian physicist
115 Mc Moscovium Moscow Oblast, Russia, where the element was first synthesised
116 Lv Livermorium Lawrence Livermore National Laboratory in Livermore, California, which collaborated with JINR on its synthesis
117 Ts Tennessine Tennessee, United States
118 Og Oganesson Yuri Oganessian, Russian physicist

Symbols and names not currently used

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The following is a list of symbols and names formerly used or suggested for elements, including symbols for placeholder names and names given by discredited claimants for discovery.

Symbol Name Atomic
number		 Notes Why not
used		 Refs
A Argon 18 A used for Argon until 1957. Current symbol is Ar.
Ab Alabamine 85 Discredited claim to discovery of astatine.
Ad Aldebaranium 70 Former name for ytterbium.
Ah Anglohelvetium 85 Discredited claim to discovery of astatine.
Ak Alkalinium 87 Discredited claim to discovery of francium.
Am Alabamine 85 Discredited claim to discovery of astatine. The symbol Am is now used for americium.
An Athenium 99 Proposed name for einsteinium.
Ao Ausonium 93 Discredited claim to discovery of neptunium.
At Austriacum 84 Discredited claim to discovery of polonium. The symbol At is now used for astatine.
Az Azote 7 Former name for nitrogen.
Bo Bohemium 93 Discredited claim to discovery of neptunium.
Bo Boron 5 Current symbol is B.
Bv Brevium 91 Former name for protactinium-234.
Bz Berzelium 90 Baskerville wrongly believed berzelium was a new element. Was actually thorium.
Cb Columbium 41 Former name for niobium.
Ch Chromium 24 Current symbol is Cr.
Cl Columbium 41 Former name for niobium. The symbol Cl is now used for chlorine.
Cm Catium 87 Proposed name for francium. The symbol Cm is now used for curium.
Cn Carolinium 90 Baskerville wrongly believed carolinium to be a new element. Was actually thorium. The symbol Cn is now used for copernicium.
Cp Cassiopeium 71 Former name for lutetium.
Cp Copernicium 112 Current symbol is Cn.
Ct Celtium 72 Discredited claim to discovery of hafnium.
Ct Centurium 100 Proposed name for fermium.
Cy Cyclonium 61 Proposed name for promethium.
D Didymium 59/60 Mixture of the elements praseodymium and neodymium. Mosander wrongly believed didymium to be an element.
Da Davyum 43 Discredited claim to discovery of technetium.
Db Dubhium 69 Eder wrongly believed dubhium to be a new element. Was actually thulium. The symbol Db is now used for dubnium.
Db Dubnium 104 Proposed name for rutherfordium. The symbol and name were instead used for element 105.
Dc Decipium 62 Delafontaine wrongly believed decipium to be a new element. Was actually samarium.
Dc Dvicaesium 87 Name given by Mendeleev to an as of then undiscovered element. When discovered, francium closely matched the prediction.
De Denebium 69 Eder wrongly believed denebium to be a new element. Was actually thulium.
Di Didymium 59/60 Mixture of the elements praseodymium and neodymium. Mosander wrongly believed didymium to be an element.
Do Dor 85 Discredited claim to discovery of astatine made by Horia Hulubei and Yvette Cauchois.
Dn Dubnadium 118 Proposed name for oganesson.
Dp Decipium 62 Delafontaine wrongly believed decipium to be a new element. Was actually samarium.
Ds Dysprosium 66 Current symbol is Dy. The symbol Ds is now used for darmstadtium.
Dt Dvitellurium 84 Name given by Mendeleev to an as of then undiscovered element. When discovered, polonium closely matched the prediction.
E Einsteinium 99 Current symbol is Es.
E Erbium 68 Current symbol is Er.
Ea Ekaaluminium 31 Name given by Mendeleev to an as of then undiscovered element. When discovered, gallium closely matched the prediction.
Eb Ekaboron 21 Name given by Mendeleev to an as of then undiscovered element. When discovered, scandium closely matched the prediction.
Eb Erebodium 42 Alexander Pringle wrongly believed erebodium to be a new element. Was likely molybdenum.
El Ekaaluminium 31 Name given by Mendeleev to an as of then undiscovered element. When discovered, gallium closely matched the prediction.
Em Ekamanganese 43 Name given by Mendeleev to an as of then undiscovered element. When discovered, technetium closely matched the prediction.
Em Emanation 86 Also called "radium emanation", the name was originally given by Friedrich Ernst Dorn in 1900.
In 1923, this element officially became radon (the name given at one time to Rn, an isotope identified in the decay chain of radium).
Em Emanium 89 Alternate name formerly proposed for actinium.
Es Ekasilicon 32 Name given by Mendeleev to a then undiscovered element. When discovered, germanium closely matched the prediction.
The symbol Es is now used for einsteinium.
Hs Hesperium 94 Discredited claim to discovery of plutonium. The symbol Hs is now used for hassium.
Et Ekatantalum 91 Name given by Mendeleev to an as of then undiscovered element. When discovered, protactinium closely matched the prediction.
Ex Euxenium 72 Discredited claim to discovery of hafnium.
Fa Francium 87 Current symbol is Fr.
Fl Florentium 61 Discredited claim to discovery of promethium. The symbol Fl is now used for flerovium.
Fl Fluorine 9 Current symbol is F. The symbol Fl is now used for flerovium.
Fr Florentium 61 Discredited claim to discovery of promethium. The symbol Fr is now used for francium.
G Glucinium 4 Former name for beryllium.
Gh Ghiorsium 118 Discredited claim to discovery of oganesson.
Gl Glucinium 4 Former name for beryllium.
Ha Hahnium 105 Proposed name for dubnium.
Hn Hahnium 108 Proposed name for hassium.
Hv Helvetium 85 Discredited claim to discovery of astatine.
Hy Mercury 80 Hy from the Greek hydrargyrum for "liquid silver". Current symbol is Hg.
I Iridium 77 Current symbol is Ir. The symbol I is now used for iodine.
Ic Incognitium 65 Demarçay wrongly believed incognitium to be a new element. Was actually terbium mixed with gadolinium.
Il Illinium 61 Discredited claim to discovery of promethium.
Il Ilmenium 41/73 Mixture of the elements niobium and tantalum. R. Hermann wrongly believed ilmenium to be an element.
Io Ionium 65 Demarçay wrongly believed ionium to be a new element. Was actually terbium.
J Jodium 53 Former name for iodine.
Jg Jargonium 72 Discredited claim to discovery of hafnium.
Jl Joliotium 105 Proposed name for dubnium.
Jp Japonium 113 Proposed name for nihonium.
Ka Potassium 19 Current symbol is K.
Ku Kurchatovium 104 Proposed name for rutherfordium.
L Lithium 3 Current symbol is Li.
Lw Lawrencium 103 Current symbol is Lr.
M Muriaticum 17 Former name for chlorine.
Ma Manganese 25 Current symbol is Mn.
Ma Masurium 43 Disputed claim to discovery of technetium.
Md Mendelevium 97 Proposed name for berkelium. The symbol and name were later used for element 101.
Ml Moldavium 87 Discredited claim to discovery of francium made by Horia Hulubei and Yvette Cauchois.
Ms Magnesium 12 Current symbol is Mg.
Ms Masrium 88 Discredited claim to discovery of radium.
Ms Masurium 43 Disputed claim to discovery of technetium.
Ms Mosandrium 65 Smith wrongly believed mosandrium to be a new element. Was actually terbium.
Mv Mendelevium 101 Current symbol is Md.
Ng Norwegium 72 Discredited claim to discovery of hafnium.
No Norium 72 Discredited claim to discovery of hafnium. The symbol No is now used for nobelium.
Np Neptunium 91 Discredited claim to discovery of protactinium. The symbol and name were later used for element 93.
Np Nipponium 43 Discredited claim to discovery of technetium. The symbol Np is now used for neptunium.
Ns Nielsbohrium 105 Proposed name for dubnium.
Ns Nielsbohrium 107 Proposed name for bohrium.
Nt Niton 86 Former name for radon.
Ny Neoytterbium 70 Former name for ytterbium.
P Lead 82 Current symbol is Pb. The symbol P is now used for phosphorus.
Pa Palladium 46 Current symbol is Pd. The symbol Pa is now used for protactinium.
Pe Pelopium 41 Former name for niobium.
Ph Phosphorus 15 Current symbol is P.
Pl Palladium 46 Current symbol is Pd.
Pm Polymnestum 33 Alexander Pringle wrongly believed polymnestum to be a new element. Was likely arsenic. The symbol Pm is now used for promethium.
Po Potassium 19 Current symbol is K. The symbol Po is now used for polonium.
Pp Philippium 67 Delafontaine discovered a new element and named it philippium. Per Teodor Cleve isolated it and renamed it holmium.
R Rhodium 45 Current symbol is Rh. (The symbol is now sometimes used for an alkyl group.)
Rd Radium 88 Current symbol is Ra.
Rf Rutherfordium 106 Proposed name for seaborgium. The symbol and name were instead used for element 104.
Ro Rhodium 45 Current symbol is Rh.
Sa Samarium 62 Current symbol is Sm.
So Sodium 11 Current symbol is Na.
Sq Sequanium 93 Discredited claim to discovery of neptunium made by Horia Hulubei and Yvette Cauchois.
St Antimony 51 Current symbol is Sb.
St Tin 50 Current symbol is Sn.
Tm Trimanganese 75 Name given by Mendeleev to an as of then undiscovered element. When discovered, rhenium closely matched the prediction. The symbol Tm is now used for thulium.
Tn Tungsten 74 Current symbol is W.
Tr Terbium 65 Current symbol is Tb.
Tu Thulium 69 Current symbol is Tm.
Tu Tungsten 74 Current symbol is W.
Ur Uralium 75 Discredited claim to discovery of rhenium.
Ur Uranium 92 Current symbol is U.
Vc Victorium 64 Crookes wrongly believed victorium to be a new element. Was actually gadolinium.
Vi Victorium 64 Crookes wrongly believed victorium to be a new element. Was actually gadolinium.
Vi Virginium 87 Discredited claim to discovery of francium.
Vm Virginium 87 Discredited claim to discovery of francium.
Va Vanadium 23 Current symbol is V.
Wo Wolfram 74 Former name for tungsten.
X Xenon 54 Current symbol is Xe. The symbol X is now used for any halogen.
Yt Yttrium 39 Current symbol is Y.

Systematic chemical symbols

These symbols are based on systematic element names, which are now replaced by trivial (non-systematic) element names and symbols. Data is given in order of: atomic number, systematic symbol, systematic name; trivial symbol, trivial name.

When elements beyond oganesson (starting with ununennium, Uue, element 119), are discovered; their systematic name and symbol will presumably be superseded by a trivial name and symbol.

Alchemical symbols

Main article: alchemical symbols

The following ideographic symbols were used in alchemy to denote elements known since ancient times. Not included in this list are spurious elements, such as the classical elements fire and water or phlogiston, and substances now known to be compounds. Many more symbols were in at least sporadic use: one early 17th-century alchemical manuscript lists 22 symbols for mercury alone.

Planetary names and symbols for the metals – the seven planets and seven metals known since Classical times in Europe and the Mideast – was ubiquitous in alchemy. The association of what are anachronistically known as planetary metals started breaking down with the discovery of antimony, bismuth and zinc in the 16th century. Alchemists would typically call the metals by their planetary names, e.g. "Saturn" for lead and "Mars" for iron; compounds of tin, iron and silver continued to be called "jovial", "martial" and "lunar"; or "of Jupiter", "of Mars" and "of the moon", through the 17th century. The tradition remains today with the name of the element mercury, where chemists decided the planetary name was preferable to common names like "quicksilver", and in a few archaic terms such as lunar caustic (silver nitrate) and saturnism (lead poisoning).

Alchemical symbols for the modern elements
Symbol Element Atomic
number		 Notes
Phosphorus 15 (discovered late)
🜍 Sulfur 16 used by Newton
Manganese 25 late; used by Torbern Bergman (1775)
♂ Iron 26 classical planetary metal of Mars
🜶 Cobalt 27 late; used by Bergman
Nickel 28 late; used by Bergman (old positional variant of arsenic, previously used for regulus of sulfur)
Zinc 30 late; used by Bergman
♀ Copper 29 classical planetary metal of Venus
🜺 Arsenic 33
☾ Silver 47 classical planetary metal of the Moon
🜛
♃ Tin 50 classical planetary metal of Jupiter
♁ Antimony 51 the newly discovered "eighth metal" was given the symbol for the Earth, which was recognized as a planet by that time
Platinum 78 late; used by Bergman et al.: a compound of ☉ gold and ☾ silver
⛢ late; symbol invented for the newly discovered planet Uranus so that it could also be used for newly recognized platinum
🜚 Gold 79 classical variant
☉ medieval variant; planetary metal of the Sun
☿ Mercury 80 classical planetary metal of Mercury
♄ Lead 82 classical planetary metal of Saturn
♆ Bismuth 83 used by Newton
♉︎ used by Bergman

Daltonian symbols

Dalton's symbols for the more common elements, as of 1806, and the relative weights he calculated. The symbols for magnesium and calcium ("lime") were replaced by 1808, and that for gold was simplified.

The following symbols were employed by John Dalton in the early 1800s as the periodic table of elements was being formulated. Not included in this list are substances now known to be compounds, such as certain rare-earth mineral blends. Modern alphabetic notation was introduced in 1814 by Jöns Jakob Berzelius; its precursor can be seen in Dalton's circled letters for the metals, especially in his augmented table from 1810. A trace of Dalton's conventions also survives in ball-and-stick models of molecules, where balls for carbon are black and for oxygen red.

Daltonian symbols for the elements
Symbol Dalton's name Modern name Atomic
number		 Notes Refs
img. char.
☉ hydrogen 1 or ⊙
glucine beryllium 4 alchemical symbol for 'sugar'
● carbone, carbon carbon 6
⦶ azote nitrogen/azote 7 alchemical symbol for niter
○ oxygen 8 or ◯
⦷ soda sodium 11
⊛ magnesia magnesium 12 alchemical symbol for magnesia
alumine aluminium 13 (4 dots)
🟕 silex silicon 14
phosphorus 15 (3 radii)
🜨 sulphur 16
potash potassium 19 (3 vertical lines)
⦾ lime calcium 20 or ◎
titanium 22 (enclosing circle) Tit⃝
manganese 25 (enclosing circle) Ma⃝
Ⓘ iron 26
Ⓝ nickel 28
cobalt 27 (enclosing circle) Cob⃝
Ⓒ copper 29 (black letter in red circle)
Ⓩ zinc 30
arsenic 33 (enclosing circle) Ar⃝
strontian strontium 38 (4 ticks)
⊕︀︀ yttria yttrium 39 (plus does not touch circle)
zircone zirconium 40 (vertical zigzag)
Ⓢ silver 47
Ⓣ tin 50
antimony 51 (enclosing circle) An⃝
barytes barium 56 (6 ticks)
cerium 58 (enclosing circle) Ce⃝
tungsten 74 (enclosing circle) Tu⃝
Ⓟ platina platinum 78 (black letter in red circle)
Ⓖ gold 79
mercury 80 (dotted inside perimeter)
Ⓛ lead 82
Ⓑ bismuth 83
Ⓤ uranium 92

Symbols for named isotopes

The following is a list of isotopes which have been given unique symbols. This is not a list of current systematic symbols (in the Atom form); such a list can instead be found in Template:Navbox element isotopes. The symbols for isotopes of hydrogen, deuterium (D) and tritium (T), are still in use today, as is thoron (Tn) for radon-220 (though not actinon; An usually instead means a generic actinide). Heavy water and other deuterated solvents are commonly used in chemistry, and it is convenient to use a single character rather than a symbol with a subscript in these cases. The practice also continues with tritium compounds. When the name of the solvent is given, a lowercase d is sometimes used. For example, d6-benzene or C6D6 can be used instead of C6.

The symbols for isotopes of elements other than hydrogen and radon are no longer used in the scientific community. Many of these symbols were designated during the early years of radiochemistry, and several isotopes (namely those in the decay chains of actinium, radium, and thorium) bear placeholder names using the early naming system devised by Ernest Rutherford.

Symbol Name Atomic
number		 Origin of symbol
Ac Actinium 89 From Greek aktinos. Name restricted at one time to Ac, an isotope of actinium. This named isotope later became the official name for element 89.
AcA Actinium A 84 From actinium and A. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of actinium.
AcB Actinium B 82 From actinium and B. Placeholder name given at one time to Pb, an isotope of lead identified in the decay chain of actinium.
AcC Actinium C 83 From actinium and C. Placeholder name given at one time to Bi, an isotope of bismuth identified in the decay chain of actinium.
AcC′ Actinium C′ 84 From actinium and C′. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of actinium.
AcC″ Actinium C″ 81 From actinium and C″. Placeholder name given at one time to Tl, an isotope of thallium identified in the decay chain of actinium.
AcK Actinium K 87 Name given at one time to Fr, an isotope of francium identified in the decay chain of actinium.
AcU Actino-uranium 92 Name given at one time to U, an isotope of uranium.
AcX Actinium X 88 Name given at one time to Ra, an isotope of radium identified in the decay chain of actinium.
An Actinon 86 From actinium and emanation. Name given at one time to Rn, an isotope of radon identified in the decay chain of actinium.
D Deuterium 1 From the Greek deuteros. Name given to H.
Io Ionium 90 Name given to Th, an isotope of thorium identified in the decay chain of uranium.
MsTh1 Mesothorium 1 88 Name given at one time to Ra, an isotope of radium.
MsTh2 Mesothorium 2 89 Name given at one time to Ac, an isotope of actinium.
Pa Protactinium 91 From the Greek protos and actinium. Name restricted at one time to Pa, an isotope of protactinium. This named isotope later became the official name for element 91.
Ra Radium 88 From the Latin radius. Name restricted at one time to Ra, an isotope of radium. This named isotope later became the official name for element 88.
RaA Radium A 84 From radium and A. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of radium.
RaB Radium B 82 From radium and B. Placeholder name given at one time to Pb, an isotope of lead identified in the decay chain of radium.
RaC Radium C 83 From radium and C. Placeholder name given at one time to Bi, an isotope of bismuth identified in the decay chain of radium.
RaC′ Radium C′ 84 From radium and C′. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of radium.
RaC″ Radium C″ 81 From radium and C″. Placeholder name given at one time to Tl, an isotope of thallium identified in the decay chain of radium.
RaD Radium D 82 From radium and D. Placeholder name given at one time to Pb, an isotope of lead identified in the decay chain of radium.
RaE Radium E 83 From radium and E. Placeholder name given at one time to Bi, an isotope of bismuth identified in the decay chain of radium.
RaE″ Radium E″ 81 From radium and E″. Placeholder name given at one time to Tl, an isotope of thallium identified in the decay chain of radium.
RaF Radium F 84 From radium and F. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of radium.
RdAc Radioactinium 90 Name given at one time to Th, an isotope of thorium.
RdTh Radiothorium 90 Name given at one time to Th, an isotope of thorium.
Rn Radon 86 From radium and emanation. Name restricted at one time to Rn, an isotope of radon identified in the decay chain of radium. This named isotope later became the official name for element 86 in 1923.
T Tritium 1 From the Greek tritos. Name given to H.
Th Thorium 90 After Thor. Name restricted at one time to Th, an isotope of thorium. This named isotope later became the official name for element 90.
ThA Thorium A 84 From thorium and A. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of thorium.
ThB Thorium B 82 From thorium and B. Placeholder name given at one time to Pb, an isotope of lead identified in the decay chain of thorium.
ThC Thorium C 83 From thorium and C. Placeholder name given at one time to Bi, an isotope of bismuth identified in the decay chain of thorium.
ThC′ Thorium C′ 84 From thorium and C′. Placeholder name given at one time to Po, an isotope of polonium identified in the decay chain of thorium.
ThC″ Thorium C″ 81 From thorium and C″. Placeholder name given at one time to Tl, an isotope of thallium identified in the decay chain of thorium.
ThX Thorium X 88 Name given at one time to Ra, an isotope of radium identified in the decay chain of thorium.
Tn Thoron 86 From thorium and emanation. Name given to Rn, an isotope of radon identified in the decay chain of thorium.
UI Uranium I 92 Name given at one time to U, an isotope of uranium.
UII Uranium II 92 Name given at one time to U, an isotope of uranium.
UX1 Uranium X1 90 Name given at one time to Th, an isotope of thorium identified in the decay chain of uranium.
UX2 Uranium X2 91 Name given at one time to Pa, an isotope of protactinium identified in the decay chain of uranium.
UY Uranium Y 90 Name given at one time to Th, an isotope of thorium identified in the decay chain of uranium.
UZ Uranium Z 91 Name given at one time to Pa, an isotope of protactinium identified in the decay chain of uranium.

Other symbols

See also: Skeletal formula § Pseudoelement symbols

General:

From organic chemistry:

Exotic atoms:

Hazard pictographs are another type of symbols used in chemistry.

See also

Notes

  1. ^ Name changed due to a standardization of, modernization of, or update to older formerly-used symbol.
  2. ^ Name designated by discredited/disputed claimant.
  3. ^ Name proposed prior to discovery/creation of element or prior to official renaming of a placeholder name.
  4. ^ Temporary placeholder name.

References

  1. IUPAC Provisional Recommendations: IR-3: Elements and Groups of Elements (PDF) (Report). IUPAC. March 2004.
  2. "Periodic Table – Royal Society of Chemistry". www.rsc.org.
  3. "Online Etymology Dictionary". etymonline.com.
  4. ^ Holden, N. E. (12 March 2004). "History of the Origin of the Chemical Elements and Their Discoverers". National Nuclear Data Center.
  5. ^ Leal, João P. (2013). "The Forgotten Names of Chemical Elements". Foundations of Science. 19 (2): 175–183. doi:10.1007/s10699-013-9326-y. S2CID 254511660.
  6. ^ Biggs, Lindy; Knowlton, Stephen (3 February 2022). "Fred Allison". Encyclopedia of Alabama.
  7. ^ Fontani, Marco; Costa, Mariagrazia; Orna, Mary Virginia (2014). The Lost Elements: The Periodic Table's Shadow Side. Oxford University Press. ISBN 9780199383344.
  8. ^ Praseodymium Archived 2018-10-08 at the Wayback Machine on was.chemistryexplained.com.
  9. Rang, F. (1895). "The Period-Table". The Chemical News and Journal of Physical Science. 72: 200–201.
  10. ^ Maurice Crosland (2004) Historical Studies in the Language of Chemistry
  11. Berzelius, Jöns Jakob. "Essay on the Cause of Chemical Proportions, and on Some Circumstances Relating to Them: Together with a Short and Easy Method of Expressing Them." Annals of Philosophy 2, Pp.443–454 (1813); 3, Pp.51–52, 93–106, 244–255, 353–364 (1814); (Subsequently republished in "A Source Book in Chemistry, 1400-1900", eds. Leicester, Henry M. & Herbert S. Klickstein. 1952.)
  12. ^ Dalton, John (1808). "III: On Chemical Synthesis - Section 1: Explanation of the Plates - Plate 4: Elements". A New System of Chemical Philosophy. Part I. Manchester: Printed by S. Russell for R. Bickerstaff, Strand, London. pp. 217–220.
  13. ^ Dalton, John (1810). "V: Compounds of two Elements - Section 12: Earths - Explanation of Plates - Plate 5: Elements". A New System of Chemical Philosophy. Part II. Manchester: Printed by Russell & Allen for R. Bickerstaff, Strand, London. pp. 546–548.
  14. IUPAC. "Isotopically Modified Compounds". IUPAC. Retrieved 31 March 2015.
  15. Morgan, G. T., ed. (1905). "Annual Reports on the Progress of Chemistry for 1904". Journal of the Chemical Society. 1. Gurney & Jackson: 268. In view of the extraordinarily complex nature of the later changes occurring in Radium, Rutherford has proposed a new and convenient system of nomenclature. The first product of the change of the radium emanation is named radium A, the next radium B, and so on.
  16. Jurczyk, M.; Rajewski, W.; Majchrzycki, W.; Wójcik, G. (1999-08-30). "Mechanically alloyed MmNi5-type materials for metal hydride electrodes". Journal of Alloys and Compounds. 290 (1–2): 262–266. doi:10.1016/S0925-8388(99)00202-9.

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