1.

The actinoids exhibit more number of oxidation states in general than the lanthanoids. This is because

Answer»

the 5f orbitals extend further from the NUCLEUS than the 4f orbitals
the 5f orbitals are more BURIED than the 4f orbitals
there is a similarity between 4fand 5f orbitals in their angular part of the wave function
the ACTINOIDS are more REACTIVE than the lanthanoids.

Solution :More the disatance between nucleus and outer orbitals, lesser will be force of attration on them . Distance between 4f orbital and nucleus.
So actinoieds EXHIBIT more number of oxidation states in gerneral than the lanthnoids.


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