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'''Antiparticles''' are small units of [[anti-matterantimatter]].

: *Many [[Subatomic Particle|particle]]s of [[matter]] have [[antimatter]] counterparts which have the same [[mass]] but opposite [[Electrical Charge|electrical charge]].: *[[Antiparticle]]s are generally denoted by a bar over the top of the symbol used for their [[matter]] counterpart.*During [[Pair-Production|pair-production]] a [[Subatomic Particle|particle]] and its '''antiparticle''' appear.: *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]].*The existence of [[antiparticle]]s is a fundamental concept in [[Particle Physics|particle physics]].*[[Antiparticle]]s are produced in high-energy collisions and natural radioactive [[Decay (Physics)|decay]].*[[Antiparticle]]s can be trapped and studied using magnetic fields in devices like Penning traps.*Understanding [[antiparticle]]s helps in exploring the symmetry and interactions of fundamental forces.*The discovery of [[antiparticle]]s confirmed the predictions of [[Quantum Field Theory|quantum field theory]].  {| border="1" style="border-collapse:collapse"| style="height:20px; width:100px; text-align:center;"|'''Antiparticle'''| style="height:20px; width:100px; text-align:center;"|'''Symbol'''| 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;"|[[Positron]]| style="height:20px; width:100px; text-align:center;"|<math>\bar{e}</math> or <math>\beta^+</math>| 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;"|<math>\bar{\nu_e}</math>| 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>|-| style="height:20px; width:120px; text-align:center;"|[[Antiup-quark]]| style="height:20px; width:120px; text-align:center;"|<math>\bar{u}</math>| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]?| style="height:20px; width:120px; text-align:center;"|<math>Q=-\frac{2}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>| style="height:20px; width:120px; text-align:center;"|<math>B=-\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>L=0</math>|-| style="height:20px; width:120px; text-align:center;"|[[Antidown-quark]]| style="height:20px; width:120px; text-align:center;"|<math>\bar{d}</math>| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]?| style="height:20px; width:120px; text-align:center;"|<math>Q=+\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>S=0</math>| style="height:20px; width:120px; text-align:center;"|<math>B=-\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>L=0</math>|-| style="height:20px; width:120px; text-align:center;"|[[Antistrange-quark]]| style="height:20px; width:120px; text-align:center;"|<math>\bar{s}</math>| style="height:20px; width:100px; text-align:center;"|[[Fundamental Particle|Fundamental]]?| style="height:20px; width:120px; text-align:center;"|<math>Q=+\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>S=+1</math>| style="height:20px; width:120px; text-align:center;"|<math>B=-\frac{1}{3}</math>| style="height:20px; width:120px; text-align:center;"|<math>L=0</math>|-| style="height:20px; width:100px; text-align:center;"|[[Antiproton]]| style="height:20px; width:100px; text-align:center;"|<math>\bar{p}</math>| 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{n}</math>| 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>|}