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d - block elements exhibit greater numbe...

d - block elements exhibit greater number of oxidation states than f - block elements. Explain.

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In case of d - block elements, the ns and (n - 1)d electrons take part in bond formation. Hence, d - block elements show variable oxidation states. In case of f - block elements, due to decrease in the screening effect of f - subshell, the influence of nucleus on the outer electrons increases and hence, these electrons are not involved in bonding. Moreover, the f - electrons are located in the anti - penultimate (n - 2) - orbitals and are greatly attracted by the nucleus. So f - electrons are reluctant to take part in bonding. Therefore, the f - block elements do not exhibit greater number of oxidation states.
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Knowledge Check

  • Which is not s-block element ?

    A
    `[Ar]4s^(2)3d^(10)4p^(6)5s^1`
    B
    `1s^(2)2s^(2)2p^1`
    C
    `[He]2s^(2)2p^(6)3s^1`
    D
    None of these

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