Question

Match the number of electrons that can be filled in the following shells:

• A. $2$
• B. $18$
• C. $8$
• D. $32$

Answer 1

K shell is the 1^st orbit having the lowest energy and filling of the electrons is from the lowest energy to the highest energy i.e the electrons are first filled in the K shell and then remaining electrons are filled in L shell.
According to $2\times$ $n^2$ formulae, the K shell can accommodate only $2$ electrons and the rest of the shells are filled with the same formulae.
The maximum number of electrons in each shell is as follows:

K-Shell will be=$2$ $\times$ $1^2$=$2$
L- Shell will be=$2$ $\times$ $2^2$ = $8$
M- Shell will be= $2$ $\times$ $3^2$ =$18$
N- Shell will be= $2$ $\times$ $4^2$= $32$