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What is lanthanide contraction? Write an...

What is lanthanide contraction? Write any two of its consequences.

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Lanthanoid contraction The overall decrease in atomic and ionic radii from lanthanum to lutetium, due to the imperfect shielding of one electron by another in the same subshell, is known as lanthanide contraction. (1) Consequences of lanthanide contraction, are as follows :
(i) Due to lanthanoid contraction, the basic character of oxides and hydroxides decreases from `La(OH)_(3)` to `Lu(0H)_(3)`
(ii) Elements of second and third d-series exhibit similar radii (e.g. Zr-160 pm, Hf-159 pm) and have very similar physical and chemical properties,
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Knowledge Check

  • Lanthanide contraction is due to

    A
    the same effective nuclear charge
    B
    the imperfect shielding on outer electrons
    C
    the appreciable shielding on outer electrons
    D
    none of these

  • The lanthanide contraction relates to :

    A
    Atomic radii
    B
    Atomic as well as `M^(3+)` radii
    C
    Valence electrons
    D
    Oxidation states

  • The lanthanide contraction relates to :

    A
    Atomic radii
    B
    Atomic as well as `M^(3+)` radii
    C
    Valence electrons
    D
    Oxidation states

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