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Éléktron (ogé disebut négatron, biasa dilambangkeun ku e−) mangrupa partikel subatomik. Dina atom, éléktron ngurilingan inti proton jeung neutron dina sarupaning konfigurasi éléktron.

Éléktron mangrupa salah sahiji golongan partikel subatomik nu disebut lepton nu dipercaya mangrupa partikel fundaméntal (nyaéta teu bisa dibeulah deui jadi bagéan nu leuwih leutik).

Éléktron mibanda spin 1/2, nu nunjukkeun yén éléktron téh hiji fermion, hartina, nuturkeun statistik Fermi-Dirac.

Dina mékanik kuantum, éléktron digambarkeun ku Dirac Equation. Dina Modél Baku fisika partikel, éléktron ngabentuk hiji doblét dina SU(2) jeung electron neutrino, as they interact through the weak interaction. The electron has two more massive partners, with the same charge but different masses: the muon and the tauon.

The antimatter counterpart of the electron is its antiparticle, the positron. The positron has the same amount of electrical charge as the electron, except that the charge is positive. It has the same mass and spin as the electron. When an electron and a positron meet, they may annihilate éach other, giving rise to two gamma-ray photons, éach having an energy of 0.511 MeV (511 keV). See also Electron-positron annihilation.

Some théorists believe the electron may be a very small black hole.