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The ionisation potential of hydrogen ato...

The ionisation potential of hydrogen atom is `13.6 eV`. The energy required to remove an electron in the `n = 2` state of the hydrogen atom is

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The energy of `2^("nd")` orbit `=-13.6xx(1)/(2^(2))=-3.4eV`, So energy required to remove it = 3.4 eV.
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