WAEC Chemistry 2014 Objective — Question 7
Question 7 of 50 from the West African Examinations Council (WAEC) Chemistry 2014 Objective paper, with the correct answer and a full explanation.
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The electron configuration of ₂₆Fe³⁺ is
- A. [Ar]4s²3d⁶
- B. [Ar]4s²3d³
- C. [Ar]4s¹3d⁴
- D. [Ar]4s⁰3d⁵Correct
Explanation
Fe (₂₆Fe) = 1s²2s²2p⁶3s²3p⁶4s²3d⁶ = [Ar]4s²3d⁶. Fe³⁺ loses 3 electrons (2 from 4s, 1 from 3d) to become [Ar]4s⁰3d⁵.
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