Neutron
Neutrons are uncharged particles found within atomic nuclei. Neutrons were discovered by James Chadwick in 1932.
The number of neutrons determines the isotope of an element. (For example, the carbon-12 isotope has 6 protons and 6 neutrons, while the carbon-14 isotope has 6 protons and 8 neutrons.) Isotopes are atoms of the same element that have the same atomic number but different masses due to a different number of neutrons.
A neutron is classified as a baryon, and consists of two down quarks and one up quark.
The proper symbol to use when representing a neutron;
See Also
Proton and Electron.