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Option 2 : La
- The correct answer is option 2, i.e., La.
- La (Lanthanum) is not an Actinide.
- Lanthanum is the first member of the Lanthanide series.
- Th (Thorium), U (Uranium) and Pu (Plutonium) are members of Actinide series and all these are radioactive in nature.
- Actinides start from Ac (Actinium) and end at Lr (Lawrencium) and there are 15 elements in the series.
- Lanthanides and Actinides belong to the f-block of the modern periodic table.
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