The electronic configuration of the elements X, Y and Z are given below

The electronic configuration of the elements X, Y and Z are given below.
(a) X = 2 (b) Y = 2, 6 © Z = 2, 8, 2
i) Which element belongs to second period ?
ii) Which element belongs to second group ?
iii) Which element belongs to 18th group?

i) Element Y belongs to second period. .
ii) Element Z belongs to second group.
iii) Element X belongs to 18th group.