(a)Write down the electronic configuration of (i) magnesium atom, and (ii) magnesium ion. (At. No. of Mg = 12)

(b)Write down the electronic configuration of (i) sulphur atom, and (ii) sulphide ion, (At. No. of S = 16)

Solution:

(a) (i) Mg = 2, 8, 2 (ii) Mg²⁺ = 2, 8

(b) (i) S = 2, 8, 6 (ii) S^2- = 2, 8, 8