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  • Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

8.37 Comment on the statement that elements of the first transition series possess many properties different from those of heavier transition elements.

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Elements of the first transition series possess many properties different from those of heavier transition elements in the following ways-

  1. The atomic size of the 1st transition series is smaller than those of 2nd and 3rd series elements. But due to lanthanoid contraction, atomic size of the 2nd series elements are nearly the same as 3rd series element of the corresponding same vertical group.
  2. In 1st transition series +2 and +3 oxidation states are more common but in the 2nd and 3rd series higher oxidation states are more common.
  3. The enthalpy of atomisation of first series elements is lower than 2nd and 3rd series elements.
  4. The melting and boiling point of the 1st transition series is less than that of heavier metals. This is because of strong metallic bonding in heavier metals.
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