Nanoscale metal catalysts particularly palladium and ruthenium have significant applications in various organic transformation reactions. At sizes between 1-4 nm, both Pd and Ru nanoparticles exhibit unusual catalytic properties in comparison to particles that are larger in diameter. Furthermore, these unusual catalytic properties are profound when the catalysts are suspended in colloidal solution relative to when the particles are immobilized on a solid support. One way to gain a better fundamental understanding of the nature of the catalysts within that size range is by studying the electrochemical properties. Differential pulse voltammetry was used to investigate the difference in electrochemical properties between various sizes of monodisperse Pd and Ru nanoparticles in the 1-4 nm size range. Well-defined peaks were obtained that reflected the discrete energy band gap. The results provide fundamental understanding the molecular behaviors of metal nanoparticle in 1-4 nm diameter range, and present insights on how these materials could be developed for use in electronic devices.