The electrons occupying the same orbital have the same values for all the quantum number except for:

n

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l

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m

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s

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Solution

The correct option is D $s$
Pauli's Exclusion principle: No two electrons can have the same set of quantum numbers. For two elecrons in the same orbital, the spin quantum number $s$ needs to be different. It can take value +1/2 or -1/2 respectively.

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