Lanthanoids are- – InterviewSolution

1.	Lanthanoids are-
Answer» 14 elements in the sixth period (atomic no. 90 to 103)that are filling4f sublevel 14 elements in the seventh period (atomic no.90 to 103 ) that are filling5f sublevel 14 elements it the sixth period (atomic no.58 to 71) that are FILLING the 4f sublevel 14 elements in theseventh period (atomic no. 50 to 71) that are filling 4f sublevel. Answer :C

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