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The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids is

1. Lesses energy difference between 5f and 6d orbitals than 4f and 5d orbitals

2. Larger atomic size of actinoids than the lanthanoids

3. More energy difference between 5f and 6d orbitals than between 4f and 5d orbitals

4. Greater reactive nature of the actinoids than the lanthanoids