There is a greater range of variable oxidation states among the actinoids than among the lanthanoids, Why ?

How would you account for the following: There is a greater range of oxidation states among the actinoids than among the lanthanoids.

How would you account for the following : (i) Many of the transition elements are virtually the same as those of the corresponding members of the second series. (iii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

How would you account for the following : (i) The metallic radii of the third (5d) series of transition metals are virtually the same as those of the corresponding group members of the seconds (4d) series. (ii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

There is a greater range of oxidation state among the actionids than that in the lanthanoids. Why ?

The reason for greater range of oxidation states in actinoids is attributed to

The cause of variable oxidation state among transition elements is

The reason for greater range of oxidation states in actinoids is attributed to -