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Lanthanoids are:

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

Subtopic: Lanthanoid & Actinoids Contraction |

86%

Level 1: 80%+

AIPMT - 2004

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