JAMB Mathematics 2022 Objective — Question 28

Question 28 of 41 from the Joint Admissions and Matriculation Board (JAMB) Mathematics 2022 Objective paper, with the correct answer and a full explanation.

Evidently there are two unpaired electrons in the p-orbitals of oxygen. What is the electronic configuration of ₈O?

A. 1s²2s²2p⁶
B. 1s²2s²2p⁴Correct
C. 1s²2s²2p²
D. 1s²2s¹2p⁵

Explanation

O (Z=8): 1s²2s²2p⁴. The 2p⁴ electrons fill as: 2px↑↓, 2py↑, 2pz↑ — giving 2 unpaired electrons in the p-orbitals.

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