Lanthanoids are...

Lanthanoids are

A

14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel.

B

14 elements in the sixth period (atomic no. 58 to 71) that are filling 4f sublevel

C

14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel

D

14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel

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The correct Answer is:

B

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