The kinetic parameters of both electron transfer steps in Zn2+ reduction at dropping indium and thallium amalgam electrodes are obtained as a function of electrode composition. Empirically it is attempted to correlate the observed dependences with several physical properties of the metal phase. The best correlation found was with the electrical field strength in the inner layer in the amalgam concentration range where the metal phase behaves according to the Sommerfeld free-electron model. At lower concentrations the rate constant is decreased owing to the low electronic density of states. The factor governing the rate of decrease for pure mercury agrees very well with the Mott factor for mercury.