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

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