| electrically neutral particle constituted from three quarks of the same kinds as in the proton NOTE 1 The neutron is a fermion and is constituted from quarks ddu. NOTE 2 Neutrons are constituents of all atomic nuclei except hydrogen 1H. NOTE 3 The neutron has a rest mass mn = 1,674 927 211(84) × 10−27 kg (CODATA 2006) and a mean life in the free state for beta decay of approximately 890 s.
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