Question

The total value of $m$ for all electrons in $N$ atom is:

Answer 1

$e^{-}$configaration of $N$ atom is ${15}^2{25}^{2}2p^3$
$n=2$ so for $n=2$ we have
$\ell =0,1$
for $\ell =0m_e=0$
for $\ell =1m_e=+1,0-1$
So total $m_e$ values $=+1,0,-1$
Hence there are three values of $m$.