MHT CET Chemistry question

Lanthanoids are [CBSE PMT 2004]

(A)14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sublevelCorrect
(B)14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel
(C)14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevel
(D)14 elements in the seventh period (atomic no. = 90 to 103) that are filling 4f sublevel

Answer: (A)

Solution

Lanthanoids (Ce to Lu, Z = 58 to 71) belong to the sixth period and fill the 4f subshell; options (b) and

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Question ID VK-074744