Moseley made revisions to the periodic table that resolved some of the problems with Mendeleev’s version. Which of these was a result of his revisions to the periodic table?

Moseley arranged the elements by atomic number—the number of protons—rather than by atomic mass. Isotopes of an element have different masses but the same number of protons, so they fit in the same place in the revised table. Thus, the table could account for variations resulting from isotopes.

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