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Question

Energy of electron in first orbit of hydrogen atom is:


A
13.6 eV
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B
27.2 eV
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C
54.4 eV
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D
none of the above
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Solution

The correct option is A $$- 13.6\ eV$$
As for hydrogen atom, 

$$z = 1,$$
$$ n=1$$. 

$$E=-13.6\dfrac{z^2}{n^2}\ eV$$. 

Substituting the value of $$n, z$$ we get 

$$E=-13.6\ eV$$

Hence, the correct option is $$\text{A}$$

Chemistry

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