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Lanthanoids are...

Lanthanoids are

A

14 elements in the seventh period (At. No. 90 to 103) that are filling 5f sublevel.

B

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

C

14 elements in the seventh period (AT. No. 58 to 71) that are filling 4f sublevel.

D

14 elements in the sixth period (AT. No. 90 to 103)

Text Solution

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The correct Answer is:
B
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