A neutron is a charge less fundamental particle that is found in every atom except the only hydrogen. Its symbol is n or n0. Protons and neutrons constitute the nucleus of atoms. Since protons and neutrons behave identically within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nuclei. Their properties and interactions are described by nuclear physics.
The number of protons in an atom is fixed, it cannot be reduced. Normally the number of neutrons is also the same as that of protons but for some atoms, this number can change such that the number of neutrons and protons in carbon is 6 but there are many forms of carbon one of which is isotope carbon-13 which has the number of neutrons Is 7 and the number of protons is 6.
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