Question

The electronic configurations of four elements
are given below. Which element does not belong
to the same family as others ?
(a) [Xe]4f¹⁴ 5d¹⁰ 6s² (b) [Kr]4d¹⁰ 5s²
(c) [Ne]3s² 3p⁵ (d) [Ar]3d¹⁰ 4s²

Answer 1

Answer:

(a) Xe.

Because its d-orbital.

Answer 2

(c) [Ne]3s²3p⁵

Explanation:

Elements Xe, Kr and Ar belong to the same group since each one of them has two electrons in the s sub shell. In contrast, element Ne has seven electrons in the valence shell and hence does not lie in the same group as the other three elements.

Option C is the answer.