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\section{Concluding Remarks}  Frank-Hertz curves for three distinct elements have been analyzed for the excitation energy of their lowest state. Of all three experiments done, Mercury and Argon were the closest to the expected NIST ASD data. Although the Neon data is inconsistent with the expected values, it is likely that there were not enough data points to properly determine a trend for the graph of $\Delta E_n$ vs. $n$, which undermined the accuracy of the value for excitation energy. Furthermore it appeared as if despite being a low density gas, Neon the mean free path was not significant. Therefore the value of excitation energy might have been better estimated by using the short mean free path limit.  Future experiments could possibly include multiple runs for the same element, better resolution - using smaller increments of $V_{acc}$, or use different parameters in order to optimize the amount of peaks and dips seen before ionization.