JAMB Chemistry 2007 Objective — Question 9

Question 9 of 50 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2007 Objective paper, with the correct answer and a full explanation.

If the electron configuration of an element is 1s2 2s2 2p5, how many unpaired electrons are there?

A. 1Correct
B. 2
C. 4
D. 5

Explanation

In the 2p5 sub-shell, five of six available p-orbital slots are filled; drawing the orbital box diagram shows only one unpaired electron.

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