Question

For the principal quantum number n = 4, the total number of different possible values of the azimuthal quantum number $l$, is :

• A. $2$
• B. $8$
• C. $4$
• D. $3$

Answer 1

The correct option is C $4$

The principal quantum number is given as $n=4$

Thus the azimuthal quantum number has values, $l=0to(n-1)$.

$\therefore l=0,1,2$ and $3$

$⟹$ Number of different values of $l$ is $4$.

Hence, option $C$ is correct.