What is the charge on an electron?

The correct answer is Option (2) → \(-1.6\times10^{-19}\,\mathrm{C}\)

The electron carries the smallest unit of negative charge, about \(1.6\times10^{-19}\) coulomb, so its charge is written \(-1.6\times10^{-19}\,\mathrm{C}\). The proton carries the same amount of positive charge, \(+1.6\times10^{-19}\,\mathrm{C}\).