. . . "deuterium"^^ . "14641046-n"^^ . . . "113802797"@en-us . "deuterium"@en-us . "0"^^ . "heavy hydrogen"@en-us . . "114641046"^^ . . . . . . . . "an isotope of hydrogen which has one neutron (as opposed to zero neutrons in hydrogen)"@en-us . "0"^^ . .