According to which principle an orbital cannot have more than two electrons?

Explanation

To answer the question "According to which principle an orbital cannot have more than two electrons?", we can follow these steps:

### Step 1: Identify the Principle
The principle that states that an orbital cannot have more than two electrons is known as the **Pauli Exclusion Principle**.

### Step 2: Understand the Rules of the Principle
The Pauli Exclusion Principle has two key rules:
1. **Maximum of Two Electrons**: An orbital can hold a maximum of two electrons.
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