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Leptons are divided into three families with 4 particles (2 particles, plus their two anti-particles) in each family. In the electron family we have the electron, positron, electron neutrino and electron anti-neutrino. Each family has a higher mass than the one before it so the tauon is heavier than the muon which is heavier than the electron. The physical reason for there being three families is completely unknown and will probably win you a Nobel prize if you can figure it out!

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12y ago

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Leptons are divided into families to account for differences in mass and electric charge. Each family consists of two particles, like the electron and the electron neutrino, and these particles interact with each other through weak nuclear force interactions. The three families of leptons are related by a property called lepton number conservation.

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10mo ago
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Q: Why are leptons divided into families?
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