If there are 13 electrons in M shell and 1 electron in N shell th en the num ber of unpaired electrons in such atom will be.....

Options

A. 5
B. 4
C. 3
D. 6

Answer

D

Explanation

K shell `therefore` n = 1 L shell `therefore` n = 2 M shell, n = 3 an d 13 electrons in it `therefore 3s^(2) 3p^(6) 3d^(5)` configuration N shell `therefore` n = 4 and 1 electron in it `therefore` `4s^(1)` configuration This configuration `3s^(2) 3p^(6) 3d^(5) 4s^(1)` is of Cr as below

`therefore` Six unpaired electrons are p resen t in this