How many times is the ionization energy of He^(+) ion as compared to that of hydrogen atom ?

How many times is the ionization energy of He^(+) ion as compared to t

1.	How many times is the ionization energy of He^(+) ion as compared to that of hydrogen atom ?
Answer» SOLUTION :IONIZATION energy of `He^(+)` ION `= Z^(2) xx I.E._(H)` `= 2^(2) xx I.E._(H) = 4 I.E_(H)`