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Why is enthalpy of atomisation is the lo...

Why is enthalpy of atomisation is the lowest for Zn in 3d series of transition elements ?

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Zinc (Z=30) has symmetrical electronic configuration `[Ar]^(18)4s^(2)3d^(10)`. As a result d-d interactions are negligible and the metallic bonds are quite weak. The element has therefore, lowest enthalpy of atomisation (126 kJ `mol^(-1)`) in the 3d transition series of elements.
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(a) How do you prepare : (i) K_(2)MnO_(4) from MnO_(2) (ii) Na_(2)Cr_(2)O_(7) from Na_(2)CrO_(4) ? (b) Account for the following : (i) Mn^(2+) is more stable than Fe^(2+) towards oxidation to +3 state. (ii) The enthalpy of atomisation is lowest for Zn in 3d series of transition elements. (iii) Actinoid elements show wide range of oxidation states. or (i) Name the elements of 3d transition series which shows maximum number of oxidation states. Why dows it show so ? (ii)Which transition element of 3d series has positive E_(M^(+)//M)^(@) value and why ? (iii) Out of Cr^(3+) and Mn^(3+) which is stronger oxidizing agent and why ? (iv) Name a member of the lanthanoid series which is well known to exhibit +2 oxidation state. (v) Complete the equation : MnO_(4)^(-) +8 H^(+) + 5e^(-) rarr

(a) How will you prepare : (i) K_(2)MnO_(4) from MnO_(2) ? (ii) Na_(2)Cr_(2)O_(7) from Na_(2)CrO_(4) ? (b) Account for the following: (i) Mn^(2+) is more stable than Fe^(2+) towards oxidation to +3 state. (ii) The enthalpy of atomisation is lowest for Zn is 3d series of the transition elements. (iii) Actinoid elements show wide range of oxidation states.

Knowledge Check

  • Which of the following does not belong to 3d series of transition elements ?

    A
    palladium
    B
    iron
    C
    vanadium
    D
    titanium

  • Which of the following does not belong to 3d series of transition elements?

    A
    Titanium
    B
    Iron
    C
    Palladium
    D
    Vanadium

  • Lowest enthalpy of atomisation among the following is of:

    A
    Sc
    B
    Cr
    C
    Mn
    D
    Zn

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    Statements-1. The metals of 4dand 5d transition series have greater enthalpies of atomisation than the corresponding elementsof the 3d series. Statements-2. The metal-metal bond in 4d and 5d series are stronger than those in the 3d series.

    Which of the following element does not belong to 4d series of transition elements?

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