It is Re2O7.
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The chemical formula for rhenium(VII) oxide is Re2O7. It is composed of two rhenium atoms and seven oxygen atoms.
The chemical formula for manganese VII oxide is Mn2O7.
The formula of manganate(VII) ion is MnO4^-.
The family element of rhenium is Group 7 (VII), also known as the manganese family or the iron family. Rhenium belongs to this family due to its position in the periodic table and similar chemical properties to other elements in this group, such as manganese, technetium, and bohrium.
The oxidation number of Mn in manganese VII oxide is +7. This is because oxygen typically has an oxidation number of -2, and there are two oxygen atoms in manganese VII oxide, giving a total oxidation number of -4. To balance the compound's charge of 0, manganese must have an oxidation number of +7.
The formula for manganese(VIII) arsenide is Mn3As4. This compound forms when manganese, which has an oxidation state of +VIII, reacts with arsenic.