Question

reare earth are generally​

Answer 1

They are often found in minerals with thorium (Th), and less commonly uranium (U). 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.

Answer 2

Answer:

Rare earth elements are not as "rare" as their name implies. ... The most abundant rare earth elements are cerium, yttrium, lanthanum and neodymium [2]. They have average crustal abundances that are similar to commonly used industrial metals such as chromium, nickel, zinc, molybdenum, tin, tungsten, and lead [1].

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