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Lanthanoids are-...

Lanthanoids are-

A

14 elements in the sixth period (atomic no. = 58 to 71) 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
As sixth period can accommodate only 18 element in the table, 14 member of HF series (atomic number 58 to 71) the periodic table. These are called as lanthanides.
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