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Lanthanide contraction occurs because...

Lanthanide contraction occurs because

A

The 4f electrons, which are gradually added, create a strong shielding effect.

B

The 4f orbitals are greater in size than the 3d and 3f orbitals.

C

The 5f orbitals strongly penetrate into the 4f orbitals.

D

The poor shielding effect of 4f electrons is coupled with increased attraction between the nucleus and the added electrons.

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The correct Answer is:
D
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Lanthanoid contraction implies

(A): Elements of second and third transition series have nearly same atomic radii (R): Lanthanide contraction is observed in the elements from atomic number 58 to 71.

The Lanthanide contraction relates to (AFMC)

What is lanthanide contraction? What are its consequences?

Regarding lanthanide contraction, some statements are given a) It arises because of the poor shielding effect of 5f-electrons b) The atomic radii and ionic radii steadily decrease from Ce to Lu c) The crystal structures and other properties are similar d) The seperation of lanthanides from one another is difficult from their salt solutions. The correct statements are

What is Lanthanoid contraction ?

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