AP Chemistrymediummcq1 pt
Which electron configuration violates Hund's rule?
A.1s² 2s² 2pₓ² 2py⁰ 2pz⁰
B.1s² 2s² 2pₓ¹ 2py¹ 2pz¹
C.1s² 2s¹
D.1s² 2s² 2p¹
Explanation
Core Concept
Hund's rule requires electrons to occupy degenerate orbitals singly before pairing. Doubling up in 2pₓ while 2py and 2pz sit empty violates that rule.
Correct Answer
A1s² 2s² 2pₓ² 2py⁰ 2pz⁰
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