Question

In the angular momentum equation for the hydrogen atom, the principal quantum number is:

• A. 1
• B. 2
• C. 3
• D. 4

Hint:

The principal quantum number \( n \) determines the allowed values of angular momentum in an atom. For hydrogen, \( n = 2 \).

Answer 1

The Correct Option is B

Step 1: Angular momentum of the electron. In the Bohr model of the hydrogen atom, the angular momentum \( L \) is quantized and is given by: \[ L = n \hbar \] Where \( n \) is the principal quantum number and \( \hbar \) is the reduced Planck’s constant.
Step 2: Conclusion. Thus, for the hydrogen atom, the principal quantum number for the angular momentum is 2.