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Lanthanoids are

1. 14 elements in the sixth period (atomic no. = 90 to 103) that are filling 4f sublevel
2. 14 elements in the seventh period (atomic no. = 90 to 103) that are filling 5f sublevel
3. 14 elements in the sixth period (atomic no. = 58 to 71) that are filling 4f sublevel
4. 14 elements in the seventh period (atomic no. = 58 to 71) that are filling 4f sublevel

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

Solution

Lanthanoids are the 14 elements in the sixth period with atomic numbers 58 to 71, characterized by the filling of the 4f sublevel.

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