Chapter 8: Problem 55
A hydrogen-like ion is an ion containing only one electron. The energies of the electron in a hydrogenlike ion are given by $$ E_{n}=-\left(2.18 \times 10^{-18} \mathrm{~J}\right) Z^{2}\left(\frac{1}{n^{2}}\right) $$ in which \(n\) is the principal quantum number and \(Z\) is the atomic number of the element. Calculate the ionization energy (in kilojoules per mole) of the \(\mathrm{He}^{+}\) ion.