WAEC Chemistry 2011 Objective — Question 2

Question 2 of 50 from the West African Examinations Council (WAEC) Chemistry 2011 Objective paper, with the correct answer and a full explanation.

Which of the following electron configurations correctly represents an inert element?

A. A. 1s²2s²2p⁴
B. B. 1s²2s²2p⁶3s²3p⁶
C. C. 1s²2s²2p⁶3s²3p⁶
D. D. 1s²2s²2p⁶Correct

Explanation

Whenever a ground state electronic configuration ends in a p⁶ orbital (2p⁶, 3p⁶, 4p⁶...), the element in question is a noble/inert gas. 1s²2s²2p⁶ ends in 2p⁶, matching option D.

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