First slide

Hydrogen -like ion

Question

In Li⁺² ion, find the angular momentum of the electron, if it is in the first orbit:

Moderate

A

3h/2π
B

9h/2п
C

h/2π
D

h/6π

Solution

The angular momentum of an electron in any orbit is given by
$\frac{nh}{2 π}$
Here they are asking for first orbit,
$so L = \frac{(1) h}{2 π} \Rightarrow L = \frac{h}{2 π}$

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