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What are the ionic radii (in Å) of N3−, O2− and F−, respectively?

1. 1.71, 1.40 and 1.36
2. 1.71, 1.36 and 1.40
3. 1.36, 1.40 and 1.71
4. 1.36, 1.71 and 1.40

Correct answer: 1.71, 1.40 and 1.36

Solution

The correct option lists the ionic radii of N3−, O2−, and F− in decreasing order, reflecting the trend that larger anions have greater ionic radii due to increased electron-electron repulsion and the number of electrons relative to protons.

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