Ionic Radius
An isoelectronic series contains O2-, F-, Na+ and Mg2+. Which species has the smallest ionic radius?
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About This Question
- Subject
- chemistry
- Chapter
- classification of elements and periodicity in properties
- Topic
- ionic radius
- Difficulty
- Medium
- Year
- 2025
Solution
Correct Answer:
Mg2+
All four ions have 10 electrons, so size depends mainly on nuclear charge. Greater nuclear charge pulls the same electron cloud more strongly and decreases radius. Since Mg2+ has the highest proton number (12), it has the smallest ionic radius among these ions.
This medium difficulty chemistry question is from the chapter classification of elements and periodicity in properties, covering the topic of ionic radius. It appeared in the 2025 exam.
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