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Reason of lanthanoid contraction is...

Reason of lanthanoid contraction is

A

Negligible scrrening effect of f orbitals

B

Increasin nuclear charge

C

Decreasing nuclear charge

D

Decreasing screening effect

Text Solution

Verified by Experts

The correct Answer is:
A
The sphape of f-orbitals is very much diffused and they have poor shielding effect. The effective nuclear charge increase which causes the contraction in the size of electron charged cloud. This contraction in the size is quite regular and known as lanthanoid contraction.
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Knowledge Check

  • Reason of lanthanide contraction is

    A
    negligble sereening effect of f-orbital
    B
    increasing unuclear charge
    C
    decreasing nuclear charge
    D
    decreasing screening effect

  • Because of lanthanoid contraction :

    A
    separation of the elements is possible
    B
    there is a very small difference in the atomic size of the transition metals of 5th and 6th period and present in the same group.
    C
    there is a gradual decrease in the basic strengths of the hydroxides of lanthanoids
    D
    All are correct.

  • Lanthanoid contraction means :

    A
    small atomic sizes of lanthanoid elements
    B
    small ionic size of lanthanoid ions.
    C
    smaller atomic size of lanthanoids as compared to transition element in the same period
    D
    decrease in atomic and ionic radii of the element of lanthanoid series in moving from left to the right.

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    The effect of lanthanoid contraction in the lanthanoid series of elements by and large means :

    State a consequence of lanthanoid contraction shown by transition elements.

    Lanthanoid contraction is due to:

    Assertion : 4d and 5d series elements have nearly same atomic radius. Reason : Lanthanoid contraction.

    Which of the following factors may be regarded as the cause of lanthanoid contraction ?

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