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Calculate the ionization energy of H(...

Calculate the ionization energy of `H_(i) He^(+)` and `Li^(2+) ` in `kJmol^(-1)`
Note n=1,Z=1,2,3 respectively `E_(n) = (2.18 xx 10^(-18) Z^(2))/( n^(2))`

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Respectively 1311.8 5247.2 and 11806 .2
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