is the same and equal to one electron
, inversely proportional to the atomic-weight of the ion. For polivalent ions
may be 2, 3, 4, or 5 electrons, but since hydrogen is at least 7 times lighter than any other ion which is ever found in solution, and its charge is but one electron, we see that the largest value which
ever has in electrolysis is its value for hydrogen, namely, about
.