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

Question

Accepted Answer

1. **Atomic Radius:** The atomic radius of an iodine atom is approximately 133 pm ($1.33 	imes 10^{-10}$ m) . 
2. **Nuclear Radius:** The radius of a nucleus is calculated using $R = R_0 A^{1/3}$, where $R_0 \approx 1.1 	imes 10^{-15}$ m and $A$ is the mass number. For Iodine-126: $R \approx 1.1 	imes 10^{-15} 	imes (126)^{1/3} \approx 1.1 	imes 5 	imes 10^{-15} \approx 5.5 	imes 10^{-15}$ m . 
3. **Discrepancy:** The provided probable answer ($2.5 	imes 10^{-11}$ m) does not match the standard atomic radius ($\sim 1.3 	imes 10^{-10}$ m) or the nuclear radius ($\sim 5.5 	imes 10^{-15}$ m). It is significantly smaller than the atomic radius and much larger than the nuclear radius. The question might refer to a specific context not fully captured or contains a data error.

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