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Give reasons:(i) Scandium (At. No. 21) is a transition element but calcium (At. No. 20) is not.(ii) The transition metal ions such as Cu+ Ag+ and Sc3+ are colourless.(iii) The melting points of transition metals of 3d series are much higher than the melting point of zinc of the same period.(iv) The radius of Fe2+ is less than that of Mn2+.(v) Actinides cations are coloured.
