If the 1^(st) ionization energy of H ato...

If the `1^(st)` ionization energy of H atom is 13.6 eV, then the `2^(nd)` ionization energy of He atom is

A

`27.2eV`

B

`40.8eV`

C

`54.4eV`

D

`108.8eV`

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