What is the meaning of Transition_element?
Any element in the d block of the periodic table (i.e. groups 3 to 12 inclusive).
The same, but excluding the group 12 elements (i.e. groups 3 to 11 inclusive).
Any of the group of metallic elements that have an incomplete inner (d) electron shell, having multiple valencies and forming coloured compounds and stable complex ions.
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