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Answered 2011-05-03 10:50:13

Depends on what version you are looking at. The integers going from 1 to around 100 are the atomic numbers of the elements and these are the numbers of protons (= numbers of electrons) in the atom. Numbers which run from 1 to around 250 and are integers are the atomic weights of isotopes, and numbers which are not integers are atomic weights of elements found in nature, which are mixtures of isiotopes.

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