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The term transition metal has two possible meanings:

In the past it referred to any element in the d-block of the Periodic Table, which includes groups 3 to 12 on the periodic table. All elements in the d-block are metals.

The modern, IUPAC definition states that a transition metal is "an element whose atom has an incomplete d sub-shell, or which can give rise to cations with an incomplete d sub-shell."

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