Which of the following statements correctly describes lanthanoids?

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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