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The D-And-f-Block Elements

Question
CBSEENCH12010869
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Lanthanoid contraction is caused due to

  • the appreciable shielding on outer electrons by 4f electrons from the nuclear charge

  • the appreciable shielding on outer electrons by 5d electrons from the nuclear charge

  • the same effective nuclear charge from Ce to Lu

  • the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

Solution

D.

the imperfect shielding on outer electrons by 4f electrons from the nuclear charge

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

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?

Why are transition elements so named?

Why are transition elements known as d-block elements?

Write the general electronic configuration of d-block elements.

Why do some exceptions to the general electronic configuration of d-block elements exists?

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