More number of oxidation states are exhibited by the actinoids than by the lanthanoids. The main rea

Question

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

Professor PC Thomas Classes · Answer

(c) : The $5 f$-orbitals extend into space beyond the $6 s$ and $6 p$-orbitals and participate in bonding. This is in direct contrast to the lanthanides where the $4 f$-orbitals are buried deep inside in the atom, totally shielded by outer orbitals and thus, unable to take part in bonding.\