Question

Question 2.22 Which of the following are isoelectronic species i.e., those having the same number of electrons?

Na+, K+, Mg2+, Ca2+, S2–, Ar

Class XI Structure of Atom Page 66

Answer 1

concept : Isoelectronic species have the same number of electrons but different atomic numbers

Note :- Number of positive charges show, number of electrons lost and number of negative charges show , number of electrons gained by atom .

Na⁺ , number of e⁻ = 11 - 1 = 10 e⁻
Mg²⁺, number of e⁻ = 12 - 2 = 10e⁻
K⁺, number of e⁻ = 19 - 1 = 18 e⁻
Ca²⁺, number of e⁻= 20 -2 = 18 e⁻
S²⁻, number of e⁻ = 16 +2 = 18e⁻
Ar , number of e⁻ = 18e⁻

now, we can observe.
isoelectronic species are
(i) Na⁺ , Mg²⁺
(ii)K⁺, Ca²⁺,S²⁻ and Ar

Answer 2

Answer:

I hope answer help to you