Which quantum number denotes the subshell in an atom?

Explanation

To determine which quantum number denotes the subshell in an atom, we can follow these steps:

### Step-by-Step Solution:

1. **Understanding Quantum Numbers**: Quantum numbers are values that describe the unique quantum state of an electron in an atom. There are four types of quantum numbers: principal (n), azimuthal (l), magnetic (m_l), and spin (m_s).

2. **Identifying the Relevant Quantum Number**: Among these quantum numbers, the one that specifically denotes the subshell is the azimuthal quantum number, also known as the angular momentum quantum number.

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