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Per NCERT (Pauli, 1926), which statement most precisely captures the EXCLUSION PRINCIPLE?
ANo two electrons can occupy the same energy level
BAn orbital can hold three electrons of identical spin
CNo two electrons in an atom can have the same set of FOUR quantum numbers — so an orbital holds at most two electrons of opposite spin
DTwo electrons in an atom must share all four quantum numbers
Answer & Solution
Correct answer: C. No two electrons in an atom can have the same set of FOUR quantum numbers — so an orbital holds at most two electrons of opposite spin
Per NCERT §Pauli, no two electrons share all four QN (n, l, m_l, m_s). One orbital ⇒ at most 2 electrons with opposite spin. Hence shell capacity 2n².
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