Definition:
   Leptons - point-like unstructured particles, absolutely stable, electrically neutral or having a charge "-1", with a spin equal "h/2" and a rest mass no more 0,511 Mev.

   Leptons - easiest of all particles known for today, in the given model are considered as elemental.

Their only three:

• Electron .
• Electronic neutrino .
• Muonic neutrino .