Question

How is periodicity of properties dependent upon number of protons in an atom?​

Answer 1

An element's location in the periodic table is largely dependent on its electrons; the number of valence shell electrons determines its group, and the type of orbital in which the valence electrons lie in determines the element's block.

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Answer 2

Atomic mass depends upon the number of protons and neutrons in the nucleus. ... As a result, the physical and chemical properties of the elements depend upon their atomic numbers rather than the atomic masses.

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