More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is
- Amore active nature of the actinoids
- Bmore energy difference between $5f$ and $6d$ orbitals than that between $4f$ and $5d$ orbitals
- Clesser energy difference between $5f$ and $6d$ orbitals than that between $4f$ and $5d$ orbitals
- Dgreater metallic character of the lanthanoids than that of the corresponding actinoids.
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