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Lanthanoids are ....

Lanthanoids are __________.

A

14 elements in the sixth period (atomic no. = 58 to71) that are filling 4f sublevel

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

Text Solution

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The correct Answer is:
A
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