*Solution*

*According to quantum mechanics theory, the energy of an electron of hydrogen atom can be given as:*

*E=-E*_{o} /n^{2}

*Here, n=1,2,3.. and E*_{o}=13.6 ev

*substitute, n=1 in the above expression as follows:*

*E=-13.6/1*^{2} ev

*=-13.6 ev*

*Convert electron volt (ev) into joule as follows:*

*1 ev=1.602×10*^{-19}J

*-13.6 ev=-13.6×1.602×10*^{-19}J

*= -21.78×10*^{-19} J

*= -2.178×10*^{-18} J

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