If sufficient energy is absorbed by an atom, an electron can be lost by the atom and a positive ion formed. The amount of energy required is called the ionization energy. In the H atom, the ionization energy is that required to change the electron from n = 1 to n = infinity. Calculate the ionization energy for the He⁺ ion. Is the ionization energy of the He⁺ more or less than that of H? (Bohr’s theory applies to He⁺ because it, like the H atom, has a single electron. The electron energy, however, is now given by E = −Z²Rhc/n², where Z is the atomic number of helium.)