Mention reasons a) Most of the transition elements are coloured b) d block elements show variable oxidation state c) d block elements show horizontal and vertical similarity in their properties
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The transition metals, groups 3–12 in the periodic table, are generally characterized by partially filled d subshells in the free elements or their cations. (Although the metals of group 12 do not have partially filled d shells, their chemistry is similar in many ways to that of the preceding groups, and we therefore include them in our discussion.)
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