Particles:
The "Standard Model" includes two "types" of matter,
Fermions and Bosons. The class of Fermions include electrons and positrons
(considered fundamental particles) and the 3-quark particles such as neutrons
and protons. The quark particles (neutrons and protons) are held together
by the strong nuclear forces (also known as particle gluons). Color charge
is believed to play a major part in the interaction of the strong forces within
the nucleus.
Bosons are carriers of force. The electromagnetic force is carried by
mass-less photons. (Electromagnetic force is the force that keeps
electrons circling the nucleus.) The W (+ and -) and Z "vector"
bosons that carry the weak nuclear forces are considered to be photons with
mass. The unique properties of the W and Z bosons are due to their
mass. 2-Quark particles are also bosons, none of which are stable.
Gravity is thought to be mediated by the particle graviton.
more: The IV classes of particles.