I didn't know this when I was involved in vetting these questions, but leptons also come in six flavours.
According to the Standard Model of particle physics, quarks and leptons are two of the three types of elementary particle. They are the basic building blocks of matter, and together they are classed as fermions.
The third class of elementary particle is the bosons. Bosons are associated with forces rather than matter. There are various types of boson, including photons, gluons, the recently discovered Higgs boson, and the hypothetical graviton of quantum gravity.
To put it another way: all elementary particles are either fermions or bosons, and fermions are either quarks or leptons.
The six flavours of quark are up, down, strange, charm, top and bottom.
The six flavours of lepton are electron, muon, tau, electron neutrino, muon neutrino and tau neutrino.
An electron is a first–generation lepton (i.e. the most familiar type of lepton), with a charge. A neutrino is a lepton with negligible mass and zero charge. There are three 'generations' of neutrino: electron neutrino, muon neutrino and tau neutrino – as listed above.
As I understand it: quarks don't exist as separate things, but they combine to make larger particles. A particle that's made up of quarks is called a hadron; a hadron that's made up of three quarks is called a baryon.
A proton is a baryon that's made up of two up quarks and one down quark; a neutron is a baryon that's made up of one up quark and two down quarks.
Does it sound as if I know what I'm talking about? If so, it's a miracle.
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