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Q.

Lanthanides are rare earth, but one of them is not available naturally. The element under consideration is

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a

 Eu 

b

 Nd 

c

 Dy 

d

 Pm

answer is D.

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Detailed Solution

  • Lanthanides are uncommon earth elements, although one of them is not found naturally.
  • Promethium (Pm), a chemical element, is the only rare-earth metal in the periodic table's lanthanide series that is not naturally occurring on Earth. 
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