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: When a [[Subatomic Particle|particle]] meets its '''antiparticle''' they [[Annihilation|annihilate]] one another producing a pair of [[photon]]s.
: Most '''antiparticles''' are given the name of their counterpart [[Subatomic Particle|particle]] with the addition of the prefix '''anti'''. However, the '''antiparticle''' counterpart of the [[electron]] is known as the [[positron]].
{| border="1" style="border-collapse:collapse"
| style="height:20px; width:100px; text-align:center;"|'''Antiparticle'''
| style="height:20px; width:100px; text-align:center;"|'''Composition'''
| style="height:20px; width:100px; text-align:center;"|[[Electrical Charge|'''Charge''']]/[[Elementary Charge|e]]
| style="height:20px; width:100px; text-align:center;"|'''[[Strangeness]]'''
| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Baryon Number|Baryon Number]]'''
| style="height:20px; width:100px; text-align:center;"|'''[[Conservation of Lepton Number|Lepton Number]]'''
|-
| style="height:20px; width:100px; text-align:center;"|
[[Antiproton]]
| style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{u}\bar{d}</math>
| style="height:20px; width:100px; text-align:center;"|<math>Q=-1</math>
| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>B=-1</math>
| style="height:20px; width:100px; text-align:center;"|<math>L=0</math>
|-
| style="height:20px; width:100px; text-align:center;"|
[[Antineutron]]
| style="height:20px; width:100px; text-align:center;"|<math>\bar{u}\bar{d}\bar{d}</math>
| style="height:20px; width:100px; text-align:center;"|<math>Q=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>B=-1</math>
| style="height:20px; width:100px; text-align:center;"|<math>L=0</math>
|-
| style="height:20px; width:100px; text-align:center;"|
[[Positron]]
| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]
| style="height:20px; width:100px; text-align:center;"|<math>Q=+1</math>
| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>B=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>L=-1</math>
|-
| style="height:20px; width:100px; text-align:center;"|
[[Anti Electron-Neutrino]]
| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]
| style="height:20px; width:100px; text-align:center;"|<math>Q=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>S=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>B=0</math>
| style="height:20px; width:100px; text-align:center;"|<math>L=-1</math>
|}