The valence state of tungsten in ammonium metatungstate is +6. According to chemical knowledge, the oxidation state of tungsten in ammonium metatungstate is +6, which is the common and stable valence state of tungsten element in ammonium metatungstate molecule.
From the chemical formula of ammonium metatungstate, its molecular formula is (NH4)6H2W12O40-XH2O, where W stands for the element tungsten. In this chemical formula, tungsten exists in the form of W12O40, i.e., twelve tungsten atoms are combined with forty oxygen atoms. This bonding indicates the high oxidation state of tungsten, which is the +6 valence. Another source clearly points out that in ammonium metatungstate, each tungsten atom is surrounded by six oxygen atoms to form octahedral coordination, which further corroborates the +6 valence state of tungsten.
Therefore, tungsten in ammonium metatungstate is +6 valence.
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