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The ionisation Energy of He^+ ion is 19...

The ionisation Energy of `He^+ ion` is `19.6x10^-18 J atom^1`. Find the energy of the last orbit of

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The energy of the first orbit of Li^(+2) = ((-19.6xx10^-18xx9)/4) J atom^-1 = -4.41xx10^-17 J atom^-1 (E_npropz^2/n^2)`
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