When an electron is removed completely from an atom, we say that the atom is ionized. An ionized atom has a net positive charge since an electron has been removed.
a. From the energy-level diagram in figure 18.20, how much energy would be required to ionize a hydrogen atom when it is in its lowest energy level?
b. How much energy would be required to ionize the atom when it is in the first excited state above the lowest level?
c. If an electron with zero kinetic energy was “captured” by an ionized hydrogen atom and went immediately to the lowest energy level, what wavelength would you expect to observe for the photon emitted in this transition?