Ionisation energy of He^(+) is 19.6 xx 1...

Ionisation energy of `He^(+)` is `19.6 xx 10^(-18)"J atom"^(-1)` The energy of the first stationary state of `Li^(2+)` is

`-4.41 xx 10^(-18) J " atom"^(-1)`

`-4.41 xx 10^(-17) J " atom"^(-1)`

`-4.41 xx 10^(-16) J " atom"^(-1)`

`-8.72 xx 10^(-18) J " atom"^(-1)`

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