An atom has `2K,8L` and `5M` electron write its electronic configuration and answer the following:

Options

A. 20
B. 18
C. 15
D. 25

Answer

C

Explanation

The electronic configuration of an atom with `2K,8L` and `5M` electron is :
`1s^(2)2s^(2)2p_(x)^(2)2p_(y)^(2)2p_(z)^(2)3s^(2)3p_(x)^(1)3p_(y)^(1)3p_(z)^(1)`
Atomic number = Number of electron `= 15`