Explain the following observations: (i) The enthalpies of atomisation of transition metals are quite high. (ii) There is a close similarity in physical and chemical properties of the 4d and 5d series of the transition elements, much more than expected on the basis of usual family relationship. (iii) The members in the actinoid series exhibit larger number of oxidation states than the corresponding members in the lanthanoid series.

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A: a.

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