MCQ
The orbital angular momentum of an electron in $2s$ orbitals is
  • A
    $ + \frac{1}{2}.\frac{h}{{2\prod }}$
  • $0$
  • C
    $\frac{h}{{2\prod }}$
  • D
    $\sqrt {2.} \frac{h}{{2\prod }}$

Answer

Correct option: B.
$0$
b
The orbital angular momentum of an electron in the $2 s -$ orbital is zero. For a given subshell with azimuthal quantum number $l$, the orbital angular momentum is given by the expression

$L =\frac{ h }{2 \pi} \sqrt{1(1+1)}$

For $2 s$ orbital, $1=0$ so $L=\frac{h}{2 \pi} \sqrt{0(0+1)}=0$

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