Assertion: hydrogen | /r/HasAspect | three isotopes
Facets:
value: deuterium (h-2)
type: OTHER
Source sentences:
text: Hydrogen has three isotopes; the others are called deuterium and tritium.
text: Hydrogen does have isotopes, which are protium (H-1), deuterium (H-2) and tritium (H-3).
text: Isotopes: Hydrogen has three isotopes, 1H (protium), 2H (deuterium) and 3H (tritium).