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:**[[Muon]] - A type of [[lepton]] often referred to as a 'heavy electron' same [[Electrical Charge|charge]] as an [[electron]] (-1.60x10<sup>-19</sup>) but a [[mass]] 206 times the [[mass]] of an [[electron]].
:**[[Neutrino]] - A type of [[lepton]] with zero [[Electrical Charge|charge]] and negligible [[mass]].
:*[[Quark]]s - A group of '''[[Subatomic Particle|subatomic particle''' particles]] believed to be [[Fundamental Particle|fundamental]] but have never been observed on their own. They always exists in either a triplet of [[quark]]s or a [[quark]]-[[antiquark]] pair.:*[[Hadron]]s - '''[[Subatomic Particle|Subatomic particles''' ]] made of [[quark]]s.
:**[[Baryon]]s - A type of [[hadron]] made of 3 [[quark]]s.
:***[[Proton]] - A type of [[baryon]] with a [[mass]] of 1.67x10<sup>-27</sup> and a [[Electrical Charge|charge]] of 1.60x10<sup>-19</sup>, made of 2 [[Up-quark]]s and 1 [[Down-quark]].
:***[[Neutron]] - A type of [[baryon]] with a [[mass]] of 1.67x10<sup>-27</sup> and zero [[Electrical Charge|charge]], made of 2 [[Down-quark]]s and 1 [[Up-quark]].