What is the radius of iodine atom? (atomic no. 53, mass no. 126)
A
2.5 × 10⁻¹¹ m
B
2.5 × 10⁻⁹ m
C
7 × 10⁻⁹ m
D
7 × 10⁻⁶ m
Step-by-Step Solution
Atomic Radius: The atomic radius of an iodine atom is approximately 133 \pm (1.33×10−10 m) .
Nuclear Radius: The radius of a nucleus is calculated using R=R0A1/3, where R0≈1.1×10−15 m and A is the mass number. For Iodine-126: R≈1.1×10−15×(126)1/3≈1.1×5×10−15≈5.5×10−15 m .
Discrepancy: The provided probable answer (2.5×10−11 m) does not match the standard atomic radius (∼1.3×10−10 m) or the nuclear radius (∼5.5×10−15 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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