'''Deuterium''' is an isotope of [[hydrogen]], with the nucleus composed of a [[proton]] and a [[nucleus]]. It has a different neutron absorption spectrum from that of ordinary hydrogen. Deuterium is stable, although it is roughly 6000 times less abundant than common hydrogen (whose nucleus contains no neutrons). | '''Deuterium''' is an isotope of [[hydrogen]], with the nucleus composed of a [[proton]] and a [[nucleus]]. It has a different neutron absorption spectrum from that of ordinary hydrogen. Deuterium is stable, although it is roughly 6000 times less abundant than common hydrogen (whose nucleus contains no neutrons). |