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Answer the following questions : (i) W...

Answer the following questions :
(i) Which element in the first series of transition elements does not exhibit variable oxidation states and why?
(ii) Why do actinoids, in general, exhibit a greater range of oxidation states than the lanthanoids ?

Text Solution

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(i) Scandium does not exhibit variable valency. It shows +3 oxidation state only. This is because after losing 3 electrons, it attains stable noble gas structure.
(ii) The energies of 5f, 6d and 7s are comparable. So all of these electrons take part in bond formation. Therefore, actinoids, in general, exhibit a greater range of oxidation states.
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Knowledge Check

  • Which transition element does not exhibit variable oxidation state?

    A
    Sc
    B
    Cu
    C
    Zn
    D
    Hg

  • Which of the following transition elements does not exhibit variable oxidation states ?

    A
    Zn
    B
    Ni
    C
    Ti
    D
    Sc

  • Fluorine does not exhibit variable oxidation states due to

    A
    its high electronegativity
    B
    smallest size of its atom
    C
    low bond dissociation energy
    D
    non availability of vacant d-orbitals.

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    which metal in the first series of transition metals exhibits +1 oxidation state most frequently and why?

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