A) \[1.27\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
B) \[0.17\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[0.57\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) \[0.99\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
Correct Answer: B
Solution :
The radius of hydrogen atom\[=0.53\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\] \[_{3}L{{i}^{+2}}\]ion also has only one electron but it has 3 protons in nucleus, hence its electron fells three times more attraction from nucleus in comparison of hydrogen atom. Thus, the radius of \[_{3}L{{i}^{+2}}\] will be \[=\frac{0.53}{3}=0.17\,\,\overset{\text{o}}{\mathop{\text{A}}}\,\]
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