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Actinoid contraction is greater from ele...

Actinoid contraction is greater from element to element than lanthanoid contraction. Why?

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The decrease in atomic (or ionic) radii (actinoid contraction) in actinoids is greater than lanthanoid contraction because 5f -electrons have poor shielding effect as compared to 4f -electrons. Therefore, the effect of increased nuclear charge leading to contraction in size is more in case of actinoids.
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What is m eant by ‘lanthanoid contraction’?

(i) Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element. (ii) What is lanthanoid contraction? Name an important alloy which contains some of the lanthanoid metals.

Knowledge Check

  • The lanthanoid contraction relates to

    A
    atomic radii
    B
    atomic as well as `M^(3+)` radii
    C
    valence electrons
    D
    oxidation states

  • Because of lanthanoid contraction, which of the following pairs of elements have nearly same atomic, radii? (Numbers in the parenthesis areratomic numbers).

    A
    Ti (22) and Zr (40)
    B
    Zr(40)andNb(41)
    C
    Zr (40) and Hf (72)
    D
    Zr (40) and Ta (73)

    • Similar Questions

    Explore conceptually related problems

    In What way, the electronic configuration of the transition elements is different from that of the non-transition elements ?

    Why do actinoids in general exhibit a greater range of oxidation states than the lanthanoids?

    Which is the last element in the series of the actinoids? Write the electronic configuration of this element. Comment on the possible oxidation state of this element.

    Hydrogen is the lightest element but helium has lowest boiling point why ?

    What are zero group elements ? Give the electronic configuration of the first four of them. Why zero group elements are also known as inert gases ?

    Define lanthanoid contraction. Write two consequences of it.

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