Question

The number of electrons present in K, L, M shell respectively is:

• A. 2,8,18
• B. 2,8,8
• C. 2,8,10
• D. 2,8,32

Answer 1

The correct option is A

2,8,18

The number of electrons in any shell is given by the formula $2n^2$ where n is the number of shell. So substituting values of n as 1, 2,3 we get the number of electrons as 2, 8, 18.