Deuterium
= Deuterium
{wiki=Deuterium}
Deuterium is a stable isotope of hydrogen, represented by the symbol \\( \\text\{D\} \\) or \\( ^2\\text\{H\} \\). It contains one proton and one neutron in its nucleus, giving it a mass number of 2, compared to the more common hydrogen isotope, protium, which has no neutrons. Deuterium occurs naturally in small amounts in water, comprising about 0.0156% of all hydrogen in the ocean.