Assign reasons for the following: (i) In the series Sc (Z = 21) to Zn (Z = 30), the enthalpy of atomisation of Zn is the lowest. (ii) Zr and Hf have almost identical radii. (iii)Transition metals show variable oxidation states. (iv) The value for copper is positive (+ 0.34 V). (v) Cr2+ is a very good reducing agent.

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