In physics, the proton (Greek language  proton = first) is a subatomic particle  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 , with a lower limit on its half-life  of about 1035 years, although some theories predict that the proton may decay .
In chemistry  and biochemistry , the proton is thought of as the hydrogen  ion , denoted H+. In this context, a proton donor is an acid  and a proton acceptor a base  (see acid-base reaction theories) .
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