AP Chemistryeasymcq1 pt
What is the ground-state electron configuration of an oxygen atom (Z = 8)?
A.1s² 2s² 2p⁴
B.1s² 2s² 2p⁶
C.1s² 2s⁶
D.1s² 2p⁶
Explanation
Core Concept
Eight electrons fill 1s (2), 2s (2), then 2p gets 4. Hund's rule spreads the four 2p electrons over the three orbitals, but the shell occupancy stays 2p⁴.
Correct Answer
A1s² 2s² 2p⁴
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