Hund's rule states that electrons in degenerate orbitals:
AAlways pair up first before going alone
BFill singly with parallel spins first, then pair
CChoose any orbital randomly without rule
DAre restricted to s and p orbitals only
Answer & Solution
Correct answer: B. Fill singly with parallel spins first, then pair
Hund's rule of maximum multiplicity: electrons in degenerate orbitals (same energy, e.g., 3 p orbitals) fill SINGLY with parallel spins first, then pair up. Example: N (2p³) = ↑ ↑ ↑ in three p orbitals.
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