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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

the radioactive number of actinoids

B

actinoid contraction

C

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

D

4f and 5d levels being close in energies

Text Solution

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The correct Answer is:
C
The reason for greater range of oxidation states in actinoid is attributed to the 5f, 6d, and 7s levels having comparable energies.
The 5f-orbitals extend into space beyond the 7s and 6p-orbitals and participate in bonding. This is in direct contrast to the lanthanides where the 4f-orbitals are buried deep inside the atom, totally shielded by outer orbitals and thus unable to take part to bonding.
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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

Knowledge Check

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

    A
    4f and 5d levels being close in energies
    B
    The radioactive nature of actinoids
    C
    Actinoid contraction
    D
    5f, 6d and 7s levels having comparable energies

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

    A
    4f and 5d levels being close in energies
    B
    The radioactive nature of actinoids
    C
    Actinoid contraction
    D
    5f, 6d and 7s levels having comparable energies

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

    A
    actinoid contraction
    B
    5f, 6d and 7s levels having comparable energies
    C
    4f and 5d levels being close in energies
    D
    the radioactive nature of actinoids.
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