Assertion: cesium | /r/HasAspect | atomic number of 55
Facets:
Source sentences:
text: Cesium is identified with the symbol Cs on the periodic table of elements, and it has an atomic number of 55.
text: It is identified with the symbol Cs on the periodic table of elements, and it has an atomic number of 55.
text: Discovered by the German chemist Robert Bunsen, namesake of the Bunsen burner, cesium has an atomic number of 55 and is the heaviest of the natural alkali metals.