A) \[0.79{AA}\]
B) \[1.59{AA}\]
C) \[3.18{AA}~~~\]
D) \[4.77{AA}\]
Correct Answer: D
Solution :
\[{{r}_{n}}={{r}_{1}}\times {{n}^{2}}\] \[{{r}_{3}}=0.53\times {{3}^{2}}\]\[=0.53\times 9=4.77{AA}\]
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