Question

An atom has $2$ electrons in $K$ shell, $8$ electrons in $L$ shell and $6$ electrons in $M$ shell. The number of electrons having $l=0$ is______.

Answer 1

Answer: 6

The electronic configuration of the atom is:
$1s^{2}2s^{2}2p^{6}3s^{2}3p^4$.
For $s$ orbital, $l=0$.
Therefore, number of electrons having $l=0$ is $6$ .