Question

An atom of an element has 2,8,11,2 electrons in K, L, M and N shells respectively. The total number of s-electrons in the atom are:

• A. 1
• B. 6
• C. 8
• D. 10

Answer 1

The correct option is C 8

$1s^{2}2s^{2}2p^{6}3s^{2}3p^{6}3d^{3}4s^2$ Total number of s-electrons=8