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More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main reason for this is:

(a) more energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

(b) lesser energy difference between 5f and 6d orbitals than that between 4f and 5d orbitals

(c) greater metallic character of the lanthanoids than that of the corresponding actinoids

(d) more active nature of the actinoids

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