JAMB Chemistry 2021 Objective — Question 12
Question 12 of 41 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2021 Objective paper, with the correct answer and a full explanation.
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The electronic configuration of an element is 1s²2s²2p⁶3s²3p⁵. It can be deduced that the element (i) is a non-metal (ii) it is a metal (iii) is a p-block element (iv) is a transition element (v) has five electrons in its outermost shell
- A. i & iii
- B. ii, iii & iv
- C. i, iii & vCorrect
- D. ii & iv
Explanation
Configuration = Cl (chlorine). Last orbital is 3p → p-block element. Chlorine is a non-metal. Outermost shell (n=3): 3s²3p⁵ = 7 electrons total in outer shell. Not a transition element (no d orbitals).
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