Assertion: cesium | /r/HasAspect | 40 known isotopes
Facets:
Source sentences:
text: Caesium ( 55 Cs) has 40 known isotopes, making it, along with barium and mercury, one of the elements with the most isotopes.
text: Caesium ( 55 Cs; or cesium) has 40 known isotopes, making it, along with barium and mercury, the element with the most isotopes.