The angular momentum of an electron is zero. In which orbital may it be present.

a) 2s

b)2p

3)3d

4)4f

The orbital angular momentum of an electron in 2s oribital is zero. This can be explained as follows:

Angular momentum = [l (l+1)]^1/2 h/2 pi , where l is the azimuthal quatum number.

For s subshell, l =0

Therefore, orbital angular momentum is zero.