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The radius of hydrogen atom in the ground state is 0.53 Å. The radius of Li²⁺ ion (atomic number = 3) in a similar state is:

1. 0.17 Å
2. 0.265 Å
3. 0.53 Å
4. 1.06 Å

Correct answer: 0.17 Å

Solution

The radius of a hydrogen-like ion is inversely proportional to the nuclear charge (Z). For Li²⁺, Z = 3, so the radius is 0.53 Å / 3 = 0.17 Å.

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