Question

The maximum number of electrons in a shell with the principal quantum number = 4 is :

• A. $2$
• B. $10$
• C. $16$
• D. $32$

Answer 1

Answer: (D)

$32$

Formula to determine the number of electrons present in any shell is as follows :
Let the shell number is "n", then number of electrons present in n shell = $2n^2$.
Hence, as per formula the number of electrons iin 4th shell = $2\times 4^2=32$.