A neutral atom has 2K, 8L and 5M electrons, choose correct one

Options

A. Atomic number is 15
B. Total number of p-electrons = 9
C. Valency of element is 2
D. It is a representative element.

Answer

A, B, D

Explanation

2K, 8L & 5 M `e^-` corresponds to
`1s^2 2s^2 2p^6 3s^3 3p^3 .` so z=15
Total no. of p `e^-` = 6+3 = 9
It is a representative element , it’s valency is 5.