The reason for the greater range of oxid...

The reason for the greater range of oxidation states of actinoids is attributed to

The radioactive nature of actinoids

Actinoid contraction

5f, 6d and 7s levels having comparable energies

4f and 5d levels being close in energies

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The reason for greater range of oxidation state in actinoids is attributed to:

(a) When a chromite ore (A) is fused with an aqueous solution of sodium carbonate in free excess of air, a yellow solution of compound (B) is obtained. This solution is filtered and acidified with sulphuric acid to form compound (C). Compound (C) on treatment with solution of KCl gives orange crystals of compound (D). Write the chemical formulae of compounds A to D. (b) Describe the cause of the following variations with reSQPect to lanthanoids and actinoids: (i) Greater range of oxidation states of actinoids as compared to lanthanoids. (ii) Greater actinoid contraction as compared to lanthanoid contraction. (iii) Lower ionisation enthalpy of early actinoids as compared to the early lanthanoids.

How would you account for the following : (i) Many of the transition elements are virtually the same as those of the corresponding members of the second series. (iii) There is a greater range of oxidation states among the actinoids than among the lanthanoids.

There is a greater range of variable oxidation states among the actinoids than among the lanthanoids, Why ?

The main reason for larger number of oxidation states exhibited by the actinoids than the corresponding lanthanoids, is :-

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