Verified Solution • 2025–26 Session
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QAIPMT-2004-Ch-2573: NEET 2004 Chemistry - Class 12 AIPMT-2004-Ch-2573 Solution: Lanthanoids are
Lanthanoids are
Multiple Choice Options
- A 14 elements in the sixth period (atomic no. 90 to 103) that are filling 4f sublevel
- B 14 elements in the seventh period (atomic number = 90 to 103) that are filling 5f sublevel
- C 14 elements in the sixth period (atomic number = 58 to 71) that are filling the 4f sublevel
- D 14 elements in the seventh period (atomic number = 50 to 71) that are filling 4f sublevel.
Step-by-Step Verified Solution
As sixth period can accommodate only 18
elements in the table, 14 members of 4f series (atomic
number 58 to 71) are separately accommodated in
a horizontal row below the periodic table. These are
called as lanthanides.