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Physics C‑class High‑importance

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Chemistry C‑class High‑importance

This article is within the scope of WikiProject Chemistry, a collaborative effort to improve the coverage of chemistry on Misplaced Pages. If you would like to participate, please visit the project page, where you can join the discussion and see a list of open tasks.ChemistryWikipedia:WikiProject ChemistryTemplate:WikiProject ChemistryChemistry C This article has been rated as C-class on Misplaced Pages's content assessment scale. High This article has been rated as High-importance on the project's importance scale.

Old posts

Why it is A? or not for example M or T? Thx in advance for answering me. Martin from Poland.

Mass number is also called atomic mass number. The A probably comes from atomic. The symbol M means molar mass. --Tsemii 11:04, 15 Oct 2004 (UTC)

I have changed the symbol listed here for neutrons and protons to lowercase p's and n's. It is important to keep these symbols in the lowercase when editing this article in the future. Ring-Ding 02:21, 29 September 2006 (UTC)

This article is currently the top search entry for "mass number" at Google! --Luigifan 21:29, 4 September 2007 (UTC)

History1861 (talk) 14:10, 6 March 2008 (UTC) The example is incorrect. Refer to the entry for Carbon 14. Carbon decays into Nitrogen

Add this page to the 'A (disambiguation)' page? —Preceding unsigned comment added by 86.45.154.143 (talk) 19:14, 23 April 2008 (UTC)

chemistry is integral to our lives

when you wonder what the earth,sky or ocean is made of, you are thinking about chemistry. when you wonder a rain puddle dries up, how a car gets energy from gasoline, or how your body gets energy from the food you eat, you are again thinking about chemistry. —Preceding unsigned comment added by 99.181.102.46 (talk) 00:28, 4 April 2009 (UTC)

umm...sayyour not given the mass number of a specific element.only the atomic number is given.so...without the mass number gow do you figure out the no. of neutrons???in other works how do you figure the mass number without them giving it to u. —Preceding unsigned comment added by Shani199310 (talk • contribs) 22:40, 11 May 2009 (UTC)

Carbon-14 decay and the electron

Does it transform two particles to electron, or should the electron be removed:

• 
  ₆C
   → 
  ₇N
   + 
  e
   + 
  ν
  _e

(
₇N
have 7 electrons or it should have a charge, and carbon has 6 electrons. 87.59.205.99 (talk) 08:00, 3 February 2012 (UTC)

This is a nuclear equation so the C nucleus has charge +6 and the N nucleus has charge +7. However the convention for nuclear equations is to show the charges only as atomic numbers, here the left subscripts 6 and 7. Dirac66 (talk) 14:42, 3 February 2012 (UTC)

Why so complex?

Misplaced Pages is a "💕 that anyone can edit". It is available to people all over the world. But why is it so hard to read some pages? I'm a 6th grader, but still, there is just too much technical jargon for this to be helpful for my homework. Can someone please simplify this? -Nathan — Preceding unsigned comment added by 76.24.133.63 (talk) 21:32, 20 November 2013 (UTC)

I half "second" this thought. Pre-med, studying for the MCAT here (so pretty good command over most sciences), and I'm mostly hung up on the line " the mass number A is identical with the baryon number B as of the nucleus as of the whole atom or ion." The "as of ... as of" is not a common grammatical construction that makes much sense here, so, akin to Nathan's question/concern above, I'm struggling to make sense of it.

Could someone with a better technical command of physics and baryons reword this so the "as of" construction doesn't obscure meaning/clarity?? PolymathGirl (talk) 18:38, 4 June 2017 (UTC)

I agree, made too complex. It should describe: A = Z + N. -DePiep (talk) 19:15, 4 June 2017 (UTC)

External links modified (January 2018)

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Crapfest

@ComplexRational: what are you doing yet another time? Isobars by definition have the same A. Would you claim it is a new for you? Learn and memorize definitions instead of inserting cosmetic whitespace. Incnis Mrsi (talk) 19:26, 30 August 2019 (UTC)

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