Larger number of oxidation states are exhibited by the actinoids than those by the lanthanoids, the main reason being
More reactive nature of the actinoids than the lanthanoids
orbitals more diffused than the orbitals
Lesser energy difference between and than between and orbitals
More energy difference between and than between and orbitals
As we learnt in
Oxidation states -
The common oxidation state of lanthanoid is +3 low occasionally +2 and +4 ions in solution or in the solid compound are also obtained.
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and
Oxidation states -
Ac shows +3 oxidation state generally but some Ac. Also, stable till +7 oxidation states.
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Actinoids exhibits more number of oxidation state in general than the Lanthanoids. This is because of lesser energy difference between 5f and 6d than between 4f and 5d orbitals.
Option 1)
More reactive nature of the actinoids than the lanthanoids
This option is incorrect
Option 2)
orbitals more diffused than the orbitals
This option is incorrect
Option 3)
Lesser energy difference between and than between and orbitals
This option is correct
Option 4)
More energy difference between and than between and orbitals
This option is incorrect
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