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What is ratio of the amount of energy required to remove an electron from hydrogen and He^(+)ion ?

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Solution :ENERGY of electron (single electron species) `E_n=-(13.6xxZ^2)/(n^2)EV`,
For hydrogen `rArr-13.6xx(1^1)/(1^2)=-13.6eV`, Energy REQUIRED to remove this electron `=+13.6eV`
For `He^(+)rArr-13.6xx(2^2)/(1^2)=-54.4eV`, Energy required to remove this electron `=+54.4eV`
Ratio of energy required `=(13.6)/(54.4)=(1)/(4)=1:4`.


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