Antimatter

British Physicist Paul Dirac predicted a particle of equal mass to an electron but of opposite charge (positive). 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 also uncharged like the particle version.

American Physicist Carl Anderson observed the positron in a cloud chamber, backing up Dirac’s theory.

Anti particles have opposite Charge, Baryon Number, Lepton Number and Strangeness.

If they are made from quarks the antiparticle is made from antiquarks