<Tr> <Th> Parity </Th> <Td> + 1 </Td> </Tr> <Tr> <Th> Condensed </Th> <Td> I (J) = 1 / 2 (1 / 2) </Td> </Tr> <P> The neutron is a subatomic particle, symbol n or n0, with no net electric charge and a mass slightly larger than that of a proton . Protons and neutrons constitute the nuclei of atoms . Since protons and neutrons behave similarly within the nucleus, and each has a mass of approximately one atomic mass unit, they are both referred to as nucleons . Their properties and interactions are described by nuclear physics . </P> <P> The chemical and nuclear properties of the nucleus are determined by the number of protons, called the atomic number, and the number of neutrons, called the neutron number . The atomic mass number is the total number of nucleons . For example, carbon has atomic number 6, and its abundant carbon - 12 isotope has 6 neutrons, whereas its rare carbon - 13 isotope has 7 neutrons . Some elements occur in nature with only one stable isotope, such as fluorine . Other elements occur with many stable isotopes, such as tin with ten stable isotopes . </P>

How does the mass of a proton and a neutron compared
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