Learning outcomes:
British Physicist Paul Dirac predicted a particle of equal mass to an electron but of opposite charge. This particle is called a positron and is the electron’s antiparticle.
Every particles has its own antiparticle. An antiparticle has the same mass as the particle version but has opposite charge. An antiproton has a negative charge, an antielectron has a positive charge, but an antineutron is uncharged just like the particle version.
American Physicist Carl Anderson observed the positron in a cloud chamber, backing up Dirac's theory.