Assertion: krypton | /r/HasProperty | discovered on may
Facets:
value: by morris m. travers
type: OTHER
value: by sir william ramsay
type: OTHER
Source sentences:
text: Krypton was discovered on May 30, 1898 by Sir William Ramsay, a Scottish chemist, and Morris M. Travers, an English chemist, while studying liquefied air.