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The gradual decrease in atomic radius fo...

The gradual decrease in atomic radius for lanthanoids element in not obeyed by

A

`Eu` only

B

`Yb` only

C

Both `Eu` & `Yb`

D

None of these

Text Solution

Verified by Experts

The correct Answer is:
C
Atomic radii increases for `Eu` & `4b` in lanthanoids series.
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Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Name an element of lanthanoid series, which is known to show +4 oxidation state. Is it a strong oxidising agent or reducing agent?

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Lanthanoids and actinoids are f-block elements in which the last electron enters the anti-penultimate energy level. The most common oxidation state of lanthanoids is +3, though +2 and +4 oxidation states are exhibited by some of the elements. In lanthanoid series, there is a progressive decrease in atomic and ionic radii, known as lanthanoid contraction. Unlike lanthanoids, actinoids show a large number of oxidation states. Write the general electronic configuration of lanthanoids.

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