Question

~~more no of oxidation states are exhibited by actinoids than by lanthanoids main reason is lesser energy difference between 5f and 6d orbitals than between 4f and 5d orbitals explain very very clear

Answer 1

The energy difference between 5f and 6d( of actinoids) is very less than that between 4f and 5d orbitals(of lanthanoids). Therefore, in actinoids, the electron can be removed from 5f and 6d both. So, they exhibit more number of oxidation state than lanthanoids.