1.

Lanthanoids are :

Answer»

14 elements in the seventh period (at. Nos. 90 to 103) that are filling 5f sublevel.
14 elements in the sixth period (at. Nos. 58 to 71) that are fiiling 4F sublevel.
14 elements in the seventh period (atmoic nos. 58 to 71) that are filling 4f sublevel.
14 elements in the sixth period (at nos. 90 to 103) that are filling 4f sublevel.

Answer :C


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