The correct formula for gallium oxide is Ga2O3.
The correct chemical formula for copper oxide is Cu2O for copper(I) oxide (cuprous oxide) and CuO for copper(II) oxide (cupric oxide).
gallium (III) carbonate - Ga2(CO3)3 gallium (III) oxide - Ga2O3
The chemical formula for aluminum oxide is Al2O3.
Ga2(C2O4)3 is the chemical formula for gallium oxalate. It is a compound made up of gallium cations and oxalate anions. Gallium oxalate is a white solid that is typically used in chemical research and synthesis.
Ionic gallium takes a 3+ (Ga3+) charge, and the hydroxide ion takes a 1- (OH-) charge. Therefore, the chemical formula (the combination of the ions to form an ionic compound) is Ga(OH)3, which satisfies all the charges. There are several other forms of ionic gallium compounds as well, include Gallium Oxide (Ga2O3) and Gallium Oxide Hydroxide (GaOOH).
One formula unit of gallium oxide (Ga2O3) contains a total of 5 atoms - 2 gallium atoms and 3 oxygen atoms.
You haven't given the rest so I assume you just want the molecular formula Gallium (III) oxide is Ga2O3
Ionic gallium has a 3+ (Ga3+) charge, and the Oxide ion has a 2- (O2-) charge. Therefore, the chemical formula (the combination of the ions to form an ionic compound) is Ga2O3, which balances the charges.
There is more than one oxide of Iron, to answer your question you need to be more specific with which oxide you are asking about.
The chemical formula for boron oxide is B2O3
The chemical formula for silver(I) oxide is Ag2O.The chemical formula for silver(II) oxide is AgO.
Al2O3 is the chemical formula of aluminium oxide.