AP Chemistry Practice Questions - AP Chemistry (Advanced Placement Chemistry) Exam

Which ground-state electron configuration correctly represents a neutral chlorine atom (Z = 17)?

1s2 2s2 2p6 3s2 3p5 1s2 2s2 2p6 3s2 3p6 1s2 2s2 2p6 3s2 3p3 1s2 2s2 2p5 3s2 3p6

Correct Answer:

1s2 2s2 2p6 3s2 3p5

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