Q.

Maximum number of electrons that can be accomodated in shell with n=4 are:                                [2023]

1 72  
2 16  
3 32  
4 50  

Ans.

(3)

Maximum number of electrons in a given shell is given as

2n2, n = principal quantum number or shell number.

Here, n=4, the maximum number of electrons = 2×(4)2=32e-