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If He^(+) ion is in its first excited st...

If `He^(+)` ion is in its first excited state then its ionization energy is

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`E_(n)=-13.6(Z^(2))/(n^(2))`
For `He^(+), E_(2)=(-13.6(2)^(2))/(2^(2))=-13.60eV`
Ionization energy `=0-E_(2)=13.60eV`
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