Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids,the main reason being
- ALesser energy difference between $5f$ and $6d$ than $4f$ and $5d$ orbitals
- BMore energy difference between $5f$ and $6d$ than between $4f$ and $5d$ orbitals
- CMore reactive nature of the actinoids than the lanthanoids
- D$4f$ orbitals are more diffused than $5f$ orbitals
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