Who discovered the charge of an electron? State the charge and mass of an electron.

The charge of an electron was determined by $R. A. Millikan$ using the oil drop experiment.
The charge of an electron is approximately $-1.6022 \times 10^{-19} \ C$.
The mass of an electron is calculated using the ratio of charge to mass $(e/m_e)$:
$m_e = \frac{e}{e/m_e} = \frac{1.6022 \times 10^{-19} \ C}{1.758820 \times 10^{11} \ C \ kg^{-1}} = 9.1094 \times 10^{-31} \ kg$.