WAEC Chemistry 2022 Objective — Question 42

Question 42 of 50 from the West African Examinations Council (WAEC) Chemistry 2022 Objective paper, with the correct answer and a full explanation.

The atom with the electron configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁴ is in

A. period 4, p-blockCorrect
B. period 3, p-block
C. period 4, d-block
D. period 3, d-block

Explanation

Since the last (outermost) orbital being filled is a p-orbital (4p⁴) and the highest principal quantum number is 4, this element is in period 4, p-block.

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