Answer
Because positive charge binds electrons more strongly, the second ionization energy of an element is always higher than the first. (After removing the least bound electron by the first ionization energy, we are left with a 1+ ion of that element, which requires more energy to abandon its least bound electron).
Work Step by Step
Because positive charge binds electrons more strongly, the second ionization energy of an element is always higher than the first. (After removing the least bound electron by the first ionization energy, we are left with a 1+ ion of that element, which requires more energy to abandon its least bound electron).