In hydrogen atom, the order of energies of sub-shell of third energy level is ……….

Explanation

To determine the order of energies of the sub-shells of the third energy level in a hydrogen atom, we can follow these steps:

### Step-by-Step Solution:

1. **Identify the Principal Quantum Number (n)**:
- For the third energy level, the principal quantum number \( n \) is equal to 3.

2. **Understand the Structure of Hydrogen Atom**:
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