JAMB Chemistry 2020 Objective — Question 6
Question 6 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2020 Objective paper, with the correct answer and a full explanation.
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6. An ion X+ has 14 electrons. How many unpaired electrons are there in the neutral atom of X?
- A. A. 4
- B. B. 3Correct
- C. C. 2
- D. D. 1
Explanation
If X+ has 14 electrons, neutral X has 15 electrons: 1s2 2s2 2p6 3s2 3p3. The 3p3 configuration has 3 unpaired electrons (Hund's rule).
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