Assertion: xenon | /r/HasProperty | characterized by nine occurring isotopes
Facets:
value: naturally
type: MANNER
Source sentences:
text: Xenon is characterized by nine naturally occurring isotopes, out of which eight (124Xe, 126Xe, 128Xe, 129Xe, 130Xe, 131Xe, 132Xe, and 134Xe) are stable and 136Xe with a half-life period greater than 2.165 X 1021 years .