# Neutron

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A neutron is a sub-atomic particle found in the nucleus of an atom. All isotopes, except H-1, contain neutrons. It is electrically neutral.

The number of neutrons in an isotope can be calculated by using this formula: $A-Z=n$*, so deuterium has 1 neutron, becuase 2-1=1.

*$n$ is the symbol for a neutron.