Assertion: cesium | /r/HasProperty | treated as hazardous material
Facets:
Source sentences:
text: Because cesium reacts violently with water, it is treated as a hazardous material and is often kept under a layer of kerosene or mineral oil or in a vacuum to prevent it from reacting and igniting due to the moisture in the air.
text: Nonradioactive caesium compounds are only mildly toxic, but the pure metal's tendency to react explosively with water means that caesium is considered a hazardous material, and the radioisotopes present a significant health and ecological hazard in the environment.