Question

Which of the following has highest orbital angular momentum?

• A. $4s$
• B. $4p$
• C. $4d$
• D. $4f$

Answer 1

The correct option is D $4f$

4f orbital has highest orbital angular momentum as it has the highest value of the azimuthal quantum number $l$.
The azimuthal quantum number $l$ for 4s, 4p, 4d and 4f orbital are 0,1, 2 and 3 respectively.
The orbital angular momentum ${\mu }_l=\sqrt{l(l+1)}\frac{h}{2\pi }$