Question

Question 3.35 Anything that influences the valence electrons will affect the chemistry of the element. Which one of the following factors does not affect the valence shell?

(a) Valence principal quantum number (n)

(b) Nuclear charge (Z)

(c) Nuclear mass

(d) Number of core electrons.

Class XI Classification of Elements and Periodicity in Properties Page 95

Answer 1

valance principal quantum number (n) , nuclear charge (Z), number of core electrons all of these factors affect the valance shell.

but in case of Nuclear mass , it doesn't affect the valance shell. basically nuclear mass depends upon sum of total number of protons and Total number of neutrons .
e.g nuclear mass = (protons + neutrons )
here, absence number of electrons or valance electrons.
hence, nuclear mass doesn't affect the valance shell.

hence, Option (c) is answer

Answer 2

Answer:

option (c) is the correct answer

Explanation:

Nuclear charge, the number of electron , and the valence principle quantum number all affects the chemistry of the valence shell.

But nuclear mass anyway is not needed to decide the chemistry of an element.