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The ionisation energy of H atom is 13.6...

The ionisation energy of H atom is `13.6 ` eV. What will be the ionisation energy of `He^(o+)` and `Li^(2+)` ions ?

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Ionisation energy=-(energy of the 1st orbit)
Energy of the 1st orbit of hydrogen`=-13.6eV`
Energy of the 1st orbit of `He^(+)=(-54.4)=54.4eV`
Energy of 1st orbit of `Li^(2+)=-13.6xx9` (Z for `Li^(2+)=3`)
`=-122.4eV`
Ionisation energy of `Li^(2+)=-(-122.4)=122.4eV`
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