Question

The maximum number of electrons in M shell is

• A. 2
• B. 12
• C. 18
• D. 24

Answer 1

The Correct Option is C

The maximum number of electrons that can occupy a shell is given by the formula $2n^2$, where $n$ is the principal quantum number representing the shell number.  

K shell: n = 1, maximum electrons = $2(1)^2 = 2$ 
L shell: n = 2, maximum electrons = $2(2)^2 = 8$ 
M shell: n = 3, maximum electrons = $2(3)^2 = 18$ 
N shell: n = 4, maximum electrons = $2(4)^2 = 32$ 

Therefore, the maximum number of electrons in the M shell is 18.