NEET 2004 Chemistry question

Lanthanoids are :-

(1)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel.
(2)14 elements in the sixth period (atomic no. 58 to 71) that are filling 4f sublevelCorrect
(3)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel
(4)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevel

Answer: (2)

Solution

Lanthanoids are the 14 elements from cerium (Z = 58) to lutetium (Z = 71) that follow lanthanum in the sixth period, in which the 4f sub-level is

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Question ID VK-089385