Calculate the energy required to remove an electron from `He_(e)^(+)` ion.

Explanation

Required energy `E=(nZ^(2)e^(4))/(8 epsi_(0)^(2)n^(2)h^(2))`
`E=-(me^(4))/(8 epsi_(0)^(2))*(Z^(2))/(n^(2))`
Here `(me^(4))/(8 epsi_(0)^(2)h^(2))=13.6eV`
`E=13.6(Z^(2))/(n^(2))eV`
for `H_(e)^(+)` ion, Z=2 and n=1
`E=(13.6xx4)/(1)`
`=54.4eV`