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On what ground can you say that scandium...

On what ground can you say that scandium `(Z=21)` is a transition element but zinc `(Z=30)` is not?

Text Solution

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Sc `(Z= 21)` contains incompletely filled 3d orbital `( 3d^(1))` whereas zinc contains compltely filled d-orbitals `( 3d^(10))` . Hence, by definition, scandium is a transition element but zinc is not.
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(a) Silver atom has completely filled 'd' orbitals (4d^10) in its ground state. How can you say that it is a transition element ? (b) Actinoids exhibit a large number of oxidation states in comparison to corresponding members of Lanthanoid series. Why?

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Knowledge Check

  • Sc (Z = 21) is a transition element but Zn(Z = 30) is not because

    A
    Both `Sc^(3+)` and `Zn^(2+)` ions are colourless and form white compounds
    B
    In case of Sc, 3d orbitals are partially filled but in Zn these are filled
    C
    Last electron is assumed to be added to 4s level in case of Zn
    D
    Both Sc and Zn do not exhibit variable oxidation states

  • Why Sc(Z=21) is not considered as transition element ?

    A
    Properties of Sc are similar to aljali metals
    B
    3d-orbitals are empty in its stable compound
    C
    Stable oxidation number of Sc is `+2`
    D
    Atomic volume of Sc is very large

  • Common oxidation state of Scandium, a transition element is /are (At. No =21)

    A
    `+4`
    B
    `+1`
    C
    `+2 and +3`
    D
    `+4 and +1`

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