electron charge

https://doi.org/10.1351/goldbook.E01982
The negative electric charge which appears on the electron or univalent ions [ 1.602×1019 coulombs or 4.803×1010 electrostatic units (esu)].
Source:
PAC, 1990, 62, 2167. (Glossary of atmospheric chemistry terms (Recommendations 1990)) on page 2186 [Terms] [Paper]