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Which of the following orders of ionic radii is correctly represented?

1. H− > H+ > H
2. Na+ > F− > O2−
3. F− > O2− > Na+
4. Al3+ > Mg2+ > N3−

Correct answer: H− > H+ > H

Solution

The ionic radius of H− is larger than H+ and H because H− has an extra electron, increasing electron-electron repulsion, while H+ has no electrons, making it the smallest.

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