The total energy of an electron in the n^{th} stationary orbit of the hydrogen atom can be obtained by

(1) $E_n=-13.6×n^2$ eV

(2) $E_n={13.6\over n^2}$ eV

(3) $E_n=-{13.6\over n^2}$ eV

(4) $E_n=-{1.36\over n^2}$ eV

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