Cl^- is <strong>NOT</strong> isoelectronic with
- A. K^+
- B. Mg^{2+} ✓
- C. S^{2-}
- D. P^{3-}
Correct Answer: B. Mg^{2+}
Explanation
The chloride ion (Cl^-) has 18 electrons. K^+, S^{2-}, and P^{3-} all have 18 electrons. The magnesium ion (Mg^{2+}) only has 10 electrons and is therefore not isoelectronic with it.
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