Terebra, Jean Baptiste Lamarck. Tableau Encyclopédique et Méthodique des Trois Regnes de la Nature, Tome Second; Vers, Coquilles, Mollusques et Polypiers. Paris 1791-1798. Photograph by D Dunlop. |

Events that are highly symmetric combinations of up to a few hundred Anaxagorean sensations are called *nuclear* events. Nuclear events are objectified as **nuclear particles**. They are modeled by bundles of quarks.

Nuclear particles must be highly symmetric so that they are stable enough to be measured, but not exactly symmetric. A few small asymmetries are needed or else an event would be nondescript and indistinct. Most nuclear particles are objectified from slightly different numbers of opposing binary sensations so that they have a spin, baryon number, lepton number, charge and strangeness that are within two or three units of zero. The way that these small asymmetries are balanced against each other determines a particle's stability or *lifetime*.

Another important particle characteristic is the *mass*. This number describes how much internal energy is leftover after the work of assembling a particle has been completed. Over the next few articles more precise meanings for these terms are developed from a discussion of quarks. We also show a way of classifying nuclear particles into 23 families based on their quark content.

Summary |

Noun | Definition | |

Nuclear Particle | A highly symmetric bundle of up to a few hundred quarks. | 8-1 |