Assertion: noble gas | /r/HasAspect | two groups:[citation
Facets:
value: from the standpoint of chemistry
type: OTHER
Source sentences:
text: From the standpoint of chemistry, the noble gases may be divided into two groups:[citation needed] the relatively reactive krypton (ionisation energy 14.0 eV), xenon (12.1 eV), and radon (10.7 eV) on one side, and the very unreactive argon (15.8 eV), neon (21.6 eV), and helium (24.6 eV) on the other.