Question

Four elements W, X, Y and Z contain 8, 11, 9 and 17 protons per atom respectively. The element which cannot form an anion is most likely to be :

(a) W

(b) X

(c) Y

(d) Z

Answer 1

Atomic No. = 8
E.C. = (2, 6)
Valency = 8 – no. of valence electrons = 8 –6=2

Atomic No. = 11
E.C. = (2, 8, 1)
Valency = 8 – no. of valence electrons = 8 – 1 = 7

So X cannot be an anion it donates and forms a cation 9 cathode seeking ion ).


(b) X