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In physics, the proton (Greek language[[1]] proton = first) is a subatomic particle [[2]] with an electric charge of one positive fundamental unit (1.602 × 10−19 coulomb) and a mass of 938.3 MeV/c2 (1.6726 × 10−27 kg), or about 1836 times the mass of an electron. The proton is observed to be stable [[3]], with a lower limit on its half-life [[4]] of about 1035 years, although some theories predict that the proton may decay [[5]].

In chemistry [[6]] and biochemistry [[7]], the proton is thought of as the hydrogen[[8]] ion [[9]], denoted H+. In this context, a proton donor is an acid [[10]] and a proton acceptor a base[[11]] (see acid-base reaction theories) [[12]].

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