Define an atomic orbital. What does angular momentum quantum number tell about an orbital ?

Explanation

### Step-by-Step Solution

**Step 1: Define an Atomic Orbital**
An atomic orbital is defined as a region in space around an atom's nucleus where there is a high probability of finding an electron. It represents the physical space where the electron is likely to be located, and the shape and size of these orbitals are determined by the quantum numbers associated with the electron.

**Step 2: Explain the Angular Momentum Quantum Number**
The angular momentum quantum number, denoted as \( l \), provides important information about the shape and type of the atomic orbital that an electron occupies. The value of \( l \) can take on integer values starting from 0 up to \( n-1 \), where \( n \) is the principal quantum number.

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