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If $13.6 \mathrm{eV}$ energy is required to ionize the hydrogen atom, then the energy required to remove an electron from $n=2$ is
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$3.4 \mathrm{eV}$
$3.4 \mathrm{eV}$
$E_n=-\frac{13.6}{n^2} \Rightarrow E_2=-\frac{13.6}{2^2}=3.4 \mathrm{eV}$
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