Question

According to Bohr orbital theory, the angular momentum of electron in 5th orbit is

• A. 25h
• B. 1h/π
• C. 10h/π
• D. 2.5h/π

Answer 1

The correct option is D

2.5h/π

Bohr orbital theory:

1. It is derived from how an atom absorbs or emits radiation.
2. When the electrons on the subatomic level jump between the allowed and stationary objects.
3. The electrons revolve around the nucleus in a fixed circular path.
4. They are termed as “orbits”, “shells”, or "energy levels.
5. The orbits are known as a “stationary objects”.

A diagram to represent the Bohr orbital theory:

The correct option is (D).

On the basis of Bohr's theory:

On the basis of Bohr's theory the angular momentum of an electron is:

$mvr=\frac{nh}{2\mathrm{\pi }}$

For the 5th orbit, the value of $n=5$

On putting the value of n in the equation, we get

Angular momentum=$\frac{5h}{2\mathrm{\pi }}=\frac{2.5h}{\mathrm{\pi }}$.