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The D-And-f-Block Elements

Question

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Why the actinoids show more variable oxidation states than lanthanoids?

Solution

In actinoids, the progressively filling 5f subshell is shielded and is far from the nucleus in comparison to the 4f subshell. Moreover the difference of the energy between 5f 6d and 7s is small. The energy are decided on the basis of (n+1) rule Orbital are as
5f =5+3=8
6d =6+2 =8
7s=7+1 =8
All value comes out same. Hence they have same energy.
Hence, the electrons from 5f subshell takes part in reaction and they all show variable oxidation state.

Some More Questions From The d-And-f-Block Elements Chapter

Which is a stronger reducing agent Cr²⁺ or Fe²⁺ and why?

Explain why Cu⁺ ion is not stable in aqueous solutions?

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

On what ground can you say that scandium (Z = 21) is a transition element but zinc (Z = 30) is not?

The outer electronic configuration of copper is 3d¹⁰ 4s¹, yet it is considered transition element. Why?

Why the melting points of transition elements are high?

Why Zn, Cd and Hg are not regarded as transition elements?

Name the first element of 3rd transition series.

Though copper, silver and gold have completely filled sets of d-orbitals yet they are considered as transition metals. Why?

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