A) 10.6 Å
B) 0.53 Å
C) 21.2 Å
D) None of these
Correct Answer: A
Solution :
\[{{r}_{n}}={{\varepsilon }_{r}}\left( \frac{{{n}^{2}}}{Z} \right)\,{{a}_{o}}=12\times \frac{({{5}^{2}})}{15}\times 0.53\]= 10.6 Å.
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