Question

What is the total value of $m$ for all electrons in N atom?

Answer 1

For $n=4$, first we have 4 values of $l=0,1,2,3.$ Now, for each value of l, we will have different values of m.

So for $l=0,m=0,forl=1,m=-2,-1,0,1,2.$

For$l=3,m=-3,-2,-1,0,1,2,3.$

So counting each m values, total values for $n=4is1+3+5+7=16$

Hence, 16 is the answer.