Discussion
Which rare earth element is not present in the earth's crust but for commercial purpose comes from the Nuclear reactors ?
Answer: A
Promethium has no stable isotopes, and it is not found in the earth's crust except in traces, so for commercial use it is obtained from nuclear reactors as a fission product. Lanthanum, cerium and samarium are present in the crust. The answer is promethium.
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