Assertion: deuterium | /r/AtLocation | trace
Facets:
Source sentences:
text: Deuterium occurs in trace amounts naturally as deuterium gas, written 2
text: Deuterium occurs in trace amounts naturally as deuterium gas, written 2H 2 or D 2 , but is most commonly found in the universe bonded with a protium 1H atom, forming a gas called hydrogen deuteride (HD or 1H2H).
text: Deuterium occurs in trace amounts naturally as deuterium gas, written ²H 2 or D 2 , but most natural occurrence in the universe is bonded with a typical ¹H atom, a gas called hydrogen deuteride (HD or ¹H²H).