Assertion: Actinoids form relatively less stable complexes as compared to lanthanoids. Reason: Actinoids can utilise their 5f orbitals along with 6d orbitals in bonding but lanthanoids do not use their 4f orbital for bonding.

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KollegeApply · Accepted Answer

Assertion is not true but reason is true. Explanation: Actinoids are more reactive than lanthanoids as they involve their 5d-orbital in the bond formation process while due to effectively shielded and greater nuclear charge 4f-orbitals are not available for bonding. Thus, lanthanoids comparatively form less complexes than actinoids. Assertion is not true but reason is true.

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