We are asked which combinations of n and I represent real orbitals, and which do not exist.

• **principal quantum number**** ****→**** **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** 0 up to (n-1)**

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

**ℓ**** = 0** → s subshell**ℓ**** = 1** → p subshell **ℓ**** = 2** → d subshell**ℓ**** = 3** → f subshell

**ℓ**** = 4** → g subshell

Which combinations of n and I represent real orbitals, and which do not exist?

a. 1s

b.2p

c. 4s

d. 2d

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