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There is great debate in the scientific community over where lanthanides and actinides should be placed within the standard periodic table. There is no universally agreed upon standard for this, and different mediums will often choose different options. Each of the four main alternatives are justifiable, though there are pros and cons to each as well.
Why is there not one option?
Main alternatives
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Lanthanide and actinides' placement in other periodic tables
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References
External links
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