Answers

2016-03-26T00:34:53+05:30
You should apply bohr's radius formula i.e.,52.9n square/z and the answer is 158.7pm
energy is2.14×10power-18

or in simple way

Energy of the electron = -13.6·Z²/n² eV 
= -13.6(3)²/(3)² 
= -13.6 eV 
= 21.72 × 10^-19 J
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2016-03-26T01:50:03+05:30
TE=-13.6 \frac{z^{2} }{n^{2}} eV
TE=-13.6X9/9
TE=-13.6eV


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