The ratio of difference in the number of electrons between K and M shells is `3 : 2` for X and Y elements respectively . 'X' possesses stable electronic configuration and M is the valence shell for both X and Y. The electronic configurations of X and Y are respectively.

Options

A. 2, 8, 5 and 2, 8, 4
B. 2, 8, 8 and 2, 8, 6
C. 2, 8, 8 and 2, 6, 6
D. 2, 8, 6 and 2, 8, 4

Answer

b

Explanation

`X : Y`
`2,8,8 " " 2,8 ,x`
`(8-2)/(x - 2) = 3/2 rArr x =6`
`:. X to 2, 8, 8 and Y to 2, 8 , 6`