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The molecular formula of aluminium oxide is Al2O3 (Al + O2). It is a chemical compound which contains both the ions Aluminum and oxygen. This is because the atoms of both ions have charges and are able to bond together.
The two atoms of aluminum and oxygen are bonded by the ionic bonding mechanism, where a positive charge on one ion, the cation, and a negative charge on another ion, the anion, come together to form an ion. To get the correct molecular formula, we can use the criss-cross method to find the correct ratio of ions that are present in a molecule.
Molecular structure of aluminium and oxide:
Aluminium is a trivalent metal, meaning that it has three electrons in its outermost shell. However, it is capable of forming an ion with a single electron, the Al3+ ion. This is the ion that is most commonly found in compounds.
Other ionic compounds of aluminum include AlCl, Al2O3, and AlO. The cation of the latter is often a sodium ion, though potassium, thallium, and rubidium can also be present.
Aluminum sulfate is a colourless salt obtained by the reaction of sulfuric acid on hydrated aluminum oxide. The commercial form of this salt, a crystalline solid with the chemical formula Al2(SO4)3, is used in paper manufacture as a binder for dyes and as a surface filler.
The most important of these sulfates is the double sulfate Al(SO4)2 *12H2O, or aluminum potassium sulfate (AlK2O3, or potash alum). A variety of other salts are produced as well by combining the alum with sulfates of univalent metals, including silver, zinc, and iron.