Assertion: cerium | /r/HasProperty | the most abundant lanthanide
Facets:
value: in more abundant than copper
type: OTHER
value: in the earth's crust
type: LOCATION
value: at 68 parts per million
type: OTHER
Source sentences:
text: In these minerals neodymium is rarely dominant (as in the case of lanthanum), with cerium being the most abundant lanthanide; some exceptions include monazite-(Nd) and kozoite-(Nd).
text: Cerium is most abundant rare earth metal.
text: Despite their name, rare-earth elements are – with the exception of the radioactive promethium – relatively plentiful in Earth's crust, with cerium being the 25th most abundant element at 68 parts per million, more abundant than copper.
text: By way of examples of the term meaning the above considerations rather than their scarcity, cerium is the 26th most abundant element in the Earth's crust and more abundant than copper, neodymium is more abundant than gold; thulium (the second least common naturally occurring lanthanide) is more abundant than iodine, which is itself common enough for biology to have evolved critical usages thereof, and even the lone radioactive element in the series, promethium, is more common than the two rarest naturally occurring elements, francium and astatine, combined.