A) \[0.265\text{ }\overset{{}^\circ }{\mathop{A}}\,\]
B) \[0.53\overset{\text{o}}{\mathop{\text{A}}}\,\]
C) \[0.132\overset{\text{o}}{\mathop{\text{A}}}\,\]
D) none of these
Correct Answer: A
Solution :
We know that \[{{E}_{n}}\,=\,\,-13.6\,\,\,\frac{{{Z}^{2}}}{{{n}^{2}}}\,\,eV\,\,and\,\,{{r}_{n}}\,=0.53\] \[\frac{{{n}^{2}}}{Z}\,(\overset{{}^\circ }{\mathop{A}}\,)\] Here for \[n=1,\,\,{{E}_{1}}=-54.4\,\,eV\] Therefore \[-54.4 =-13.6\,\,\frac{{{Z}^{2}}}{{{I}^{2}}}\,\,\,\Rightarrow \,\,Z=2\]
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