Lanthanides are known asA. rare earth elementsB. 4-f series elementsC. – InterviewSolution

1.	Lanthanides are known asA. rare earth elementsB. 4-f series elementsC. `1^(st)` inner transition elementsD. all of these
Answer» Correct Answer - D We know that, lanthanides are not widely spread in earth crust. Hence named as rare earth elements.

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