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4 Apr 2018 This page explains what a transition metal is in terms of its There is not a huge jump in the amount of energy you need to remove the third electron compared with the first and second. Jim Clark (Chemguide.co.uk). Back toIn all the chemistry of the transition elements, the 4s orbital behaves as the outermost, This last bit about the formation of the ions is clearly unsatisfactory. Explains why many complex ions of transition metals are coloured, whereas The Sc3+ ion doesn't count as a transition metal ion because its 3d level is empty. This page describes the general features of transition metal chemistry, and provides links to other pages on the site where some of the material is covered in Explains what a transition metal is and looks at the general features of their chemistry. There isn't a huge jump in the amount of energy you need to remove the