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D-block elements: the transition metals in the middle of the periodic table D-electron: responsible for bonding and reactivity Electron configuration: arrangement of electrons in the orbitals of metals
1 They are paramagnetic. 2  The transition metal group is called the d-block of the periodic table. 3  There are 35 elements located in the d-block. 4  Sometimes the elements of column twelve of the periodic table (zinc, cadmium, mercury, copernicium) are not included as part of the transition metal group.