How the mass of a neutron is equal to that of a proton ?
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The mass of a neutron is slightly greater than the mass of a proton, which is 1 atomic mass unit (amu). (An atomic mass unit equals about 1.67×10−27 kilograms.) A neutron also has about the same diameter as a proton, or 1.7×10−15 meters.
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neutron and protons are in the centre of the atom so they have same mass
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