11.1.8—An antiparticle has the same mass but opposite charge to the corresponding

A particle’s antiparticle has equal rest mass and opposite electric charge; for example, a positron is the antiparticle of an electron.

Keep particle identity separate from radiation type and track conservation laws when a particle–antiparticle pair is created or annihilated.

Electron–positron annihilation can produce photons whose total energy reflects the particles’ rest energy and motion.

An antiparticle is not simply a particle travelling backwards in space, and equal mass does not mean equal charge.