Neutron
Nuclear Physics
One of the basic particles which make up an atom. A neutron and a proton have about the same weight, but the neutron has no electrical charge.
- — Glossary of Nuclear Science Terms retrieved 2014-05-20
An electrically neutral subatomic particle, which is stable when bound in an atomic nucleus. Neutrons and protons form nearly the entire mass of atomic nuclei.
Astrophysics
A baryon with electric charge zero; it has the basic structure of two down quarks and one up quark (held together by gluons). The neutral component of an atomic nucleus is made from neutrons. Different isotopes of the same element are distinguished by having different numbers of neutrons in their nuclei.
- — The Universe Adventure Glossary retrieved 2014-05-20