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What is the cause of Lanthanide contract...

What is the cause of Lanthanide contraction.

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General electronic configuration of lanthanides Is `4f^(1-14) 5d^(0-1) 6s^(2)`. The distinguishing electrons of these elements enter 4f-subshell one by one. The f-orbtals, being too much diffushed in shape have ery poor shielding effect. So the attraction of the nucleus for the electron is highly increased and hence the lanthanide contraction is observed.
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Knowledge Check

  • Reason of lanthanoid contraction is-

    A
    negligible screening effect of f-orbitals
    B
    increasing nuclear charge
    C
    decreasing nuclear charge
    D
    decreasing screening effect

  • Reason of lanthanoid contraction is -

    A
    negligible screening effect of f - orbitals
    B
    increasing nuclear charge
    C
    decreasing nuclear charge
    D
    decreasing screening effect

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