alleryThe Pauli exclusion principle states that two electrons in an atom cannot have:
AAll four quantum numbers identical (n, l, m_l, m_s)
BSame mass
CSame energy
DSame charge
Answer & Solution
Correct answer: A. All four quantum numbers identical (n, l, m_l, m_s)
**Pauli:** no two electrons can have all four quantum numbers identical.
So an orbital (fixed n, l, m_l) can hold at most 2 electrons differing only in m_s (+1/2, -1/2).
Explains the maximum 2 electrons per orbital.
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