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The d-And-f-Block Elements
Question
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Which of the following factors may be regarded as the main cause of lanthanide contraction?

  • Poor shielding of one of 4f electron by another in the subshell

  • Effective shielding of one of 4f electrons by another in the subshell

  • Poorer shielding of 5d electrons by 4f electrons

  • Greater shielding of 5d electrons by 4f electrons

Answer

A.

Poor shielding of one of 4f electron by another in the subshell

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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?