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What is the radius of iodine atom (At. no. 53, mass no. 126)?

1. 2.5 × 10⁻¹¹ m
2. 2.5 × 10⁻⁹ m
3. 7 × 10⁻⁹ m
4. 7 × 10⁻⁶ m

Correct answer: 2.5 × 10⁻⁹ m

Solution

The radius of an atom is typically on the order of 10⁻¹⁰ m. For iodine, the radius is approximately 2.5 × 10⁻⁹ m, which corresponds to option B.

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