Why Pauli exlusion principle is called exlusion principle ?

Explanation

### Step-by-Step Solution:

1. **Understanding the Pauli Exclusion Principle**: The Pauli Exclusion Principle states that no two electrons in an atom can have the same set of four quantum numbers. Each electron is described by a unique combination of these quantum numbers.

2. **Quantum Numbers**: The four quantum numbers are:
- Principal quantum number (n): Indicates the energy level.
- Azimuthal quantum number (l): Indicates the shape of the orbital.
- Magnetic quantum number (m_l): Indicates the orientation of the orbital.
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