To solve this problem, let’s first define the 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 to infinity

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

**• ****magnetic quantum number (m**_{ℓ}**)** **→ **range of values from **-****ℓ**** to +****ℓ****.**

**Let’s check each set of quantum numbers given: **

**a. n = 2; ****ℓ = 1; ****m**_{ℓ} = -1

Which set of quantum numbers cannot specify an orbital?

a. n = 2, l = 1, m_{l} = -1

b. n = 3, l = 2, m_{l} = 0

c. n = 3, l = 3, m_{l} = 2

d. n = 4, l = 3, m_{l} = 0

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