Assertion: known lepton | /r/HasProperty | the electron
Facets:
Source sentences:
text: The best known lepton is the electron (e-).
text: There are three well-known leptons that are electrically charged: Electron (e), Tauon (τ) and Muon (μ).
text: The best known lepton is the electron (e -).
text: There are six known leptons: the electron, the muon, the tau (all with a charge of -1), the electron neutrino, the muon neutrino and the tau neutrino (all without charge).
text: When Rosenfeld named them, the only known leptons were electrons and muons, whose masses are indeed small compared to nucleons—the mass of an electron (0.511 MeV/c2) and the mass of a muon (with a value of 105.7 MeV/c2) are fractions of the mass of the "heavy" proton (938.3 MeV/c2).