Question

Calculate and compare the ionization energy of He+ with that of that of Be 3+. Assume the ionization comes from the ground state. What is the ionization energy from n = 3 for each of these ions?

This is a quantum chemistry problem. Please help.

Answer 1

energy f an electron in hydrogen like species = -2.18*10^-18*z^2/n^2

      1) for He^+ ion

                     E = -2.18*10^-18*2^2/3^2

   E = -9.68*10^-19 J/atom

2) for Be^+3 ion

      E = -2.18*10^-18*4^2/3^2

   E = -3.87*10^-18 J/atom

the ionisation energy of Be^+3 is gretaer than He^+ ion.so it is very difficult to remive the electron from Be^+2 as compared to He^+ ion.