Assertion: krypton | /r/ObjectUse | used in lighting
Facets:
Source sentences:
text: Krypton, like the other noble gases, is used in lighting and photography.
text: Kr and Xe are also used for lighting, and electronics (a fast growing market).
text: Contrary to original thinking, however, Krypton has been made to react with the highly electronegative elements and is used in lighting and other commercial purposes.