In tetrabromotungsten (WBr4), the element tungsten has a valence of +4. Each bromine atom has an oxidation state of -1 and since tetrabromotungsten is an electrically neutral compound, the total oxidation state of the tungsten element needs to offset the total oxidation state of the bromine atoms. It can be deduced that the oxidation state of the element tungsten is +4.
It should be noted that tungsten is a transition metal with several possible oxidation states. In addition to the +4 oxidation state, tungsten can also exhibit oxidation states of +2, +3, +5, and +6, depending on the compounds it forms with other elements. In tetrabromotungsten, tungsten exists in the +4 oxidation state, forming chemical bonds with four bromine atoms. This oxidation state is the most stable in this particular compound of tetrabromotungsten.
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