Assertion: noble gas | /r/Synonym | rare gases
Facets:
value: in the atmosphere
type: LOCATION
Source sentences:
text: These gases are present in very small quantities in the atmosphere and so they are also called rare gases.
text: Noble gases are rare in the atmosphere but some such as radon come in radioactive forms and can contribute to cancer.
text: The noble gases, also known as the inert gases or rare gases, are located in Group VIII or International Union of Pure and Applied Chemistry (IUPAC) group 18 of the periodic table.
text: Although the noble gases have been called the rare gases, they aren't particularly uncommon on Earth or in the universe.