Recall that the ** quantum numbers** that define an electron are:

• the **principal quantum number (n) → **energy level in orbitals and its value could be **any positive integer** starting from 1

• **angular momentum quantum number (ℓ)**** ****→ ****(l) has to be at least 1 less than n, **range of values from** 0 up to (n-1)**

▪ Each **ℓ value **corresponds to a **subshell/sublevel**:

The accompanying drawing
shows a contour plot for a d_{yz} orbital. Consider the quantum numbers that could potentially correspond to this orbital.

What is the value of the angular momentum quantum number, l?

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