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The D-And-f-Block Elements

Question
CBSEENCH12010815
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Identify the incorrect statement among the following –

  • d-Block elements show irregular and erratic chemical properties among themselves

  • La and Lu have partially filled d orbitals and no other partially filled orbitals

  • The chemistry of various lanthanoids is very similar

  • 4f and 5f orbitals are equally shielded

Solution

D.

4f and 5f orbitals are equally shielded

4f and 5f belong to different energy levels, hence the shielding effect is on them is not the same.Shielding of 4f is more than 5f

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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