To determine the possible values of ℓ and m_{ℓ} when n = 3 , let’s first define the possible values of the first three quantum numbers:

**•**** 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

**• magnetic quantum number (mℓ)** **→ **range of values from **-****ℓ**** to +** **ℓ****.**

How many possible values for l and m _{l} are there when (a) n = 3?

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