WAEC Chemistry 2024 Objective — Question 18
Question 18 of 50 from the West African Examinations Council (WAEC) Chemistry 2024 Objective paper, with the correct answer and a full explanation.
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18. Which of the following arrangements of elements is in order of increasing ionization energy?
- A. S, P, Si, Al
- B. Si, Al, P, S
- C. Al, Si, P, SCorrect
- D. P, S, Al, Si
Explanation
Ionization energy generally increases across a period, giving the expected trend Al < Si < P < S (note: phosphorus's half-filled 3p³ configuration actually makes its real ionization energy exceed sulphur's, but Al<Si<P<S is the intended answer).
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