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How many electrons can fit in a single orbital?
A3
B4
C1
D2 (with opposite spins)
Answer & Solution
Correct answer: D. 2 (with opposite spins)
Pauli exclusion: each orbital holds at most 2 electrons with opposite spins (one +1/2, one -1/2). So no two electrons in an atom have the same set of 4 quantum numbers.
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