Question

why atomic number considered to be more appropriate parameter than atomic mass for the classification of elements in periodic table​

Answer 1

because The properties of elements depend upon valence electrons in the atom which in turn depends on the total number of electrons, i.e., atomic number. Therefore, atomic number is a more appropriate parameter than atomic mass for classification of elements.

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Answer 2

Answer Because atomic number increases at a period while atomic mass doesn't increases with a period. Atomic number is number of electrons while atomic mass is the mass of nucleus of that atom.