Lanthanoids are – InterviewSolution

1.	Lanthanoids are
Answer» 14 ELEMENTS in the sixth period (ATOMIC no. 90 to 103) that are FILLING 4f sublevel 14 elemenets in the seventh period (atomic number = 90to103) that are filling 5f sublevel 14 elements in the sixth period (atomic number = 58to71) that are filling the 4f sublevel 14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel Answer :C

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