Using the Bohr model formula for the $H$ atom energy levels, calculate the ionization energy $($I$.$E$.)$ of

the Hydrogen atom in electron$-$volts. The ionization energy is defined as the energy of the transition

from $H$ in the ground state $(n=1)$ to the ionized $H^{+}+e^{-}$state with zero electron kinetic energy. The

latter state corresponds to $n=.$ Hint: $\frac{1}{{}^2}=0.$