Question

Why is it that atomic number is more important than atomic mass in predicting chemical periodicity of elements​

Answer 1

atomic number is more important than atomic mass (weight) because it's the most basic thing. without atomic number, everything will be complicated. like electronic configuration, calculating valency, valence electrons etc........

Hope it helps you....

Answer 2

Answer:

Atomic number is Number of electrons in an atom. Now, Most of the chemical properties depend upon its valency electrons and Electronic configuration.So, atomic number is more important to a chemist, than its relative atomic mass.