Unusual formal oxidation states of metals are important in biochemical processes, the notable ones being Fe(IV) and Fe(V) in Cytochrome P450-containing systems.
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The low oxidation state of Ga in Ga(III)Cl3, along with the low electronegativity and high polarisability, allow Ga(III)Cl3 to behave as a "Soft Acid" in terms of the HSAB theory.
Thallic compound, a compound which contains thallium in the +3 oxidation state