• The universe is made up of?matter?particles (protons, neutrons, electrons etc.)
• All matter particles have antimatter counterparts
  • Antimatter particles are?identical?to their matter counterpart but with the?opposite?charge

   

• This means if a particle is positive, its antimatter particle is negative and vice versa
• Common matter-antimatter pairs are shown in the diagram below:

This table summarises the electric charge for typical particle-antiparticle pairs

• Apart from electrons, the corresponding antiparticle pair has the same name with the prefix?‘a(chǎn)nti-’?and a line above the corresponding matter particle symbol
• A neutral particle, such as a neutron or neutrino or photon,?is its own antiparticle

Mass of Matter & Antimatter

• Although antimatter particles have the opposite charges to their matter counterparts, they still have?identical mass and rest mass-energy
  • The rest mass-energy of a particle is the energy equivalent to the mass of the particle at rest

   

This table summarises typical particle-antiparticle pair masses and rest mass energies