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The reason for greater range of oxidatio...

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

A

Actinoid contraction

B

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

C

4f and 5d levels being close in energies

D

The radioactive nature of actinoids

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The correct Answer is:
B
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The reason for the greater range of oxidation states of actinoids is attributed to

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.

(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.

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

Which element show highest oxidation state in actinoid

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