We studied the Franck-Hertz Experiment, based on our textbook \cite{Melissinos_2003}, for two different atoms: neon and argon. We found the lowest excitation energy level for neon to occur at \(19.4993\pm 0.6\) eV. Whereas, we found the lowest excitation energy level for argon to occur at \(10.7991\pm 0.02\) eV. The argon data was shown to be the most precise measurements. We conclude that there must have been some systematic error for the neon experiment.