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groups 3 to 7 (IUPAC -- IIIB-VIIB or IIIA-VIIA earlier systems) are called early transition metals because they form the first half of the transition series. This means, for example, that their maximum valency, expressed in their oxy-acids and salts (titanates, vanadates, chromates, and permanganates) matches their group number, that their complexes are slow to react, etc. This contrasts with the late transition metals (IUPAC groups 8 to 12) which tend to have a maximum valency of 2 or 3, and fast reacting complexes.

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12y ago

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