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

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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^–9 m

Correct Option: A

53 electrons in iodine atom are distributed as 2, 8, 18, 18, 7
∴ n = 5

r_n = (0.53 × 10^-10)	n²
	Z

=	0.53 × 10^-10 × 5²	= 2.5 × 10^-11m
	53