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The ground state energy of hydrogen atom is $-13.6 \mathrm{eV}$. When its electron is in the first excited state, its excitation energy is
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$10.2 \mathrm{eV}$
Excitation energy $=\mathrm{E}_{\mathrm{f}}-\mathrm{E}_{\mathrm{i}}$
$=-3.4-(-13.6)=10.2 \mathrm{eV}$
$=-3.4-(-13.6)=10.2 \mathrm{eV}$
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