WAEC Chemistry 2022 Objective — Question 38

Question 38 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.

The electron configuration of carbon atom in its excited state is

A. 1s²2s²2p_x²2p_y⁰
B. 1s²2s²2p_x¹2p_y¹
C. 1s²2s¹2p_x¹2p_y¹2p_z¹Correct
D. 1s¹2s²2p_x¹2p_y¹2p_z¹

Explanation

In its excited state, one of carbon's 2s electrons is promoted to the empty 2p orbital, giving four unpaired electrons across 2s and 2p: 1s²2s¹2p_x¹2p_y¹2p_z¹.

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