Determine the charge required to pass through an electrolyte in...

For a monovalent material, the valency is $1$, which means one electron is involved in the liberation of one atom at the electrode.

The charge required to liberate one atom is equal to the magnitude of the charge of one electron.

$q = e = 1.6 \times 10^{-19} \text{ C}$

Alternatively, using Faraday's laws of electrolysis, the charge required to liberate one mole ($N_A$ atoms) of a monovalent substance is $1 \text{ F} \approx 96500 \text{ C}$.

The charge required for one atom is:

$q = \dfrac{F}{N_A} = \dfrac{96500}{6.022 \times 10^{23}} \approx 1.6 \times 10^{-19} \text{ C}$