The amount of energy required to remove the electron from a He+ ion in its ground state is

If Z is the atomic number and n is the Bohrs orbit, then energy required to remove electron from nth state is given by 13.6Z2n2eVSo energy required to remove electron from He^+ion in ground state is (Z = 2, n = 1)⇒13.6(2)2(1)2⇒54.4eV