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Why Zn, Cd and Hg are not considered as ...

Why `Zn, Cd` and `Hg` are not considered as typical transitions elements ?

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Transition elements have incomplete `d`-orbitals. `Zn, Cd` and `Hg` are the end members of the first three series of the transition elements. The electronic configuration of `Zn, Cd` and `Hg` are represented by general formula `(n-1)d^(10) n s^(2)`.
Since in these elements and their ions in stable state, the `d`-orbitals are completely filled hence they do not show general properties of transition elements, e.g.
`Zn = 3d^(10) 4s^(2)` and `Zn^(2+) = 3d^(10) 4s^(0)`
`Cd = 4d^(10), 5s^(2)` and `Cd^(2+) = 4d^(10) 5s^(0)`
`Hg = 5d^(10), 6s^(2)` and `Hg^(2+) = 5d^(10) 6s^(0)`
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Why are Zn, Cd and Hg normally not regarded as transition elements ?

Zn, Cd and Hg are not regarded as transition metals. Give reason.

Knowledge Check

  • 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

  • The following is not typical transition element

    A
    Cu
    B
    Ag
    C
    Au
    D
    Hg

  • Assertion : Zn, Cd and Hg are not regarded as transition elements. Reason : The electronic configurations of Zn, Cd and Hg are represented by the general formula (n-1)d^10ns^2 .

    A
    If both assertion and reason are true and reason is the correct explanation of assertion.
    B
    If both assertion and reason are true and reason not is the correct explanation of assertion.
    C
    If assertion is trun but reason is false.
    D
    If both assertion and reason are false.

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    Why elements of group 12 are not considered as transition elements ?

    Why is zinc not regarded as a transition element ?

    Read the given passage and answer the questions number 1 to 5 that follow : The d-block of the periodic table contains the elements of the groups 3 - 12 and are known as transition elements. In general, the electronic configuration of these elements is (n - 1) d^(1-10)ns^(1-2) . The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e., 3d, 4d and 5d series. However, Zn Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation states, complex formation, formation of coloured ions and alloys, catalytic activity, etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point. Why are Zn, Cd and Hg non-transition elements ?

    Read the given passage and answer the questions number 1 to 5 that follow : The d-block of the periodic table contains the elements of the groups 3 - 12 and are known as transition elements. In general, the electronic configuration of these elements is (n - 1) d^(1-10)ns^(1-2) . The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e., 3d, 4d and 5d series. However, Zn Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation states, complex formation, formation of coloured ions and alloys, catalytic activity, etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point. Why is Cu^(2+) ion coloured while Zn^(2+) ion is colourless in aqueous solution ?

    Read the given passage and answer the questions number 1 to 5 that follow : The d-block of the periodic table contains the elements of the groups 3 - 12 and are known as transition elements. In general, the electronic configuration of these elements is (n - 1) d^(1-10)ns^(1-2) . The d-orbitals of the penultimate energy level in their atoms receive electrons giving rise to the three rows of the transition metals i.e., 3d, 4d and 5d series. However, Zn Cd and Hg are not regarded as transition elements. Transition elements exhibit certain characteristic properties like variable oxidation states, complex formation, formation of coloured ions and alloys, catalytic activity, etc. Transition metals are hard (except Zn, Cd and Hg) and have a high melting point. Why do transition metals and their compounds show catalytic activity ?

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