JAMB Chemistry 2025 Objective — Question 36

Question 36 of 40 from the Joint Admissions and Matriculation Board (JAMB) Chemistry 2025 Objective paper, with the correct answer and a full explanation.

Which ion has the same electronic configuration as neon?

A. O²⁻
B. Na⁺
C. Al³⁺
D. All of the aboveCorrect

Explanation

Neon: 1s²2s²2p⁶. O²⁻ gains 2e⁻ → 1s²2s²2p⁶ ✓. Na⁺ loses 1e⁻ → 1s²2s²2p⁶ ✓. Al³⁺ loses 3e⁻ → 1s²2s²2p⁶ ✓. All three are isoelectronic with neon.

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