n.
Fundamental particle with no electric charge , little mass , and a spin value of 1 2 .
Neutrinos belong to the lepton family of subatomic particle s. There are three types of neutrino, each associated with a charged lepton: the electron, the muon, and the tau. Neutrinos are the most penetrating of subatomic particles because they react with matter only by the weak force. They do not cause ionization , because they are not electrically charged. All types of neutrino have masses much smaller than their charged partners.