A) \[0.17\overset{o}{\mathop{\text{A}}}\,\]
B) \[0.265\overset{o}{\mathop{\text{A}}}\,\]
C) \[0.53\overset{o}{\mathop{\text{A}}}\,\]
D) \[1.06\overset{o}{\mathop{\text{A}}}\,\]
Correct Answer: A
Solution :
\[{{r}_{n}}=\frac{{{n}^{2}}{{a}_{0}}}{Z}\] \[{{r}_{1}}(H)=\frac{{{a}_{0}}}{Z}={{a}_{0}}=0.53\overset{o}{\mathop{\text{A}}}\,\] \[{{r}_{1}}(L{{i}^{2+}})=\frac{{{a}_{0}}}{3}=\frac{0.53}{3}=0.17\overset{o}{\mathop{\text{A}}}\,\]
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