ЦТ Chemistry Practice Questions - ЦТ ЦЭ Chemistry (Belarus Centralized Testing Centralized Exam) Exam

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What is the ground-state valence electron configuration and the number of unpaired electrons in an isolated phosphorus atom (Z = 15)?

3s² 3p³ with 3 unpaired electrons 3s² 3p⁴ with 2 unpaired electrons 3s¹ 3p⁴ with 3 unpaired electrons 3s² 3p¹ with 1 unpaired electron

Correct Answer:

3s² 3p³ with 3 unpaired electrons

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