Q7 of 26 Page 1

(i) Why do actinoids show wide range of oxidation states?

(ii) Why is actinoid contraction greater than lanthanoid contraction?


(i) Actinoids exhbit greater range of oxidation state unlike lanthanoids due to comparable energies of 5f, 6d and 7s orbitals. Moreover, 5f orbitals are not as buried as 4f and hence 5f electrons can participate in bondng.


(ii) From element to element actinoid contraction is greater compared to lanthanoid contraction because the 5f electrons themselves provide very poor shielding effect.


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(ii)


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(i) Write down the IUPAC name of the following complex: K3[Fe(CN)6]

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