Fixed total angular momentum.
The direction however is not specified by this number.
To determine the quantum angular momentum, we need the magnetic quantum number, which then selects which orbital exactly we are talking about.
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This is a section about Azimuthal quantum number!
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The azimuthal quantum number, also known as the angular momentum quantum number or orbital quantum number, is denoted by the symbol \( l \). It is one of the four quantum numbers used to describe the quantum state of an electron in an atom. Here's a summary of its key features: 1. **Definition**: The azimuthal quantum number defines the shape of the electron's orbital and is related to the angular momentum of the electron in that orbital.