Atoms - Result Question 6
7. What is the radius of iodine atom (At. no. 53, mass no. 126)
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======= ####7. What is the radius of iodine atom (At. no. 53, mass no. 126)
c3eec34ec6b1fad69db54a20ad4b2dca40c2aa54 (a) $2.5 \times 10^{-11} m$
(b) $2.5 \times 10^{-9} m$
(c) $7 \times 10^{-9} m$
(d) $7 \times 10^{-6} m$
[1988]
Topic 2: Bohr Model & The Spectra of the Hydrogen Atom
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Answer:
Correct Answer: 7. (a)
Solution:
- (a) 53 electrons in iodine atom are distributed as $2,8,18,18,7$
$ \begin{aligned} \therefore n & =5 \\ r_n & =(0.53 \times 10^{-10}) \frac{n^{2}}{Z} \\ & =\frac{0.53 \times 10^{-10} \times 5^{2}}{53}=2.5 \times 10^{-11} m \end{aligned} $
