✅ Aluminium Oxide Formula ⭐️⭐️⭐️⭐️⭐️

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Writing the Formula for Aluminum Oxide

Question Video: Formula of Aluminum Oxide

Video Transcript

What is the formula of aluminum oxide?

In this case, the formula that the question is looking for is the number of atoms of each type of element present in the compound. For instance, the chemical formula for methane is CH₄, one carbon atom and four hydrogen atoms. Let’s start by breaking up the name aluminum oxide into two parts, aluminum and oxide. We can use the principles of the naming of ionic compounds to work out what the formula of aluminum oxide is. In the name of ionic compounds, the bit that describes the cation comes first. And the bit that describes the anion comes second.

For the cation portion, if the ion is monatomic, then we simply use the name of the element. In this case, the name of our cation is aluminium. Aluminium has the symbol Al and as it is in group 13 of the periodic table forms ions with a three plus charge. The second part of an ionic compound name is the anion. If the anion is monatomic, then the anion portion of the name is the root of the element name plus “ide”. Here, the phrase monatomic simply means that the ion is derived from one atom. In this compound, our negative ion, the anion, is called oxide. The ide portion means that the ion is monatomic. And the ox portion refers to oxygen.

If you refer to your periodic table, you’ll see that the symbol for oxygen is O and that oxygen will form two minus ions because it is in group 16. Ionic compounds must be neutral overall. So we need two equivalents of aluminium three plus and three equivalents of oxygen two minus to make a neutral compound. We can check that it’s neutral overall by doing two times three plus three times minus two. This is equal to six minus six which is equal to zero. So the formula of aluminum oxide is Al₂O₃.

Aluminium Oxide Formula

Aluminium oxide formula is given here to help student easily learn and remember the formula during class tests or even in semester exams. Aluminium oxide is a chemical compound of oxygen and aluminium and occurs naturally in various minerals such as corundum, bauxite, etc. This compound is mostly amphoteric in nature and basically has chemical, industrial and commercial applications. Let us look at the formula below.

Aluminium Oxide Chemical Formula

The formula of aluminium oxide is given as Al2O3. How is this formula generated? First of all, we have to consider that aluminium is a metal and Oxygen is a non-metal making it an ionic compound. There is some charge in the aluminium and oxygen ions. Aluminium has a +3 charge whereas oxygen has -2 charge. On applying the criss-cross method we get the formula of aluminium oxide. Usually, aluminium loses three electrons while oxygen gains two electrons in the chemical process and this is mainly done to achieve stability.

Molar Mass101.960 g·mol−1
Melting Point2,072 °C
Boiling Point2,977 °C

Aluminium Oxide Structural Formula

Below is the diagram of the aluminium oxide structural formula.

Aluminum Oxide

Aluminum oxide is a common, naturally occurring compound that’s employed in various industries, most particularly in the production of aluminum. The compound is used in production of industrial ceramics. Its most common crystalline form, corundum, has several gem-quality variants, as well.

Chemical Properties

There are many different forms of aluminum oxide, including both crystalline and non-crystalline forms. The chemical formula for Aluminum Oxide is Al₂O₃. It’s an electrical insulator, which means it doesn’t conduct electricity, and it also has relatively high thermal conductivity. In addition, in its crystalline form, corundum, its hardness makes it suitable as an abrasive. The high melting point of aluminum oxide makes it a good refractory material for lining high-temperature appliances like kilns, furnaces, incinerators, reactors of various sorts, and crucibles.

Use in Production of Aluminum

The most common use of aluminum oxide is in the production of metal aluminum. Metallic aluminum is reactive with oxygen, which could cause corrosion to build up. However, when aluminum bonds with oxygen to form aluminum oxide, it creates a thin coating that protects it from oxidation. This keeps the aluminum from corroding and losing strength. The thickness and other properties of the oxide layer can be changed by using the anodizing process. Aluminum oxide is also a product of the aluminum smelting process.

Corundum Gemstones

The most common crystalline form of aluminum oxide is corundum. Both rubies and sapphires are gem-quality forms of corundum. They owe their distinctive coloring to trace impurities. Rubies get their deep red color and laser qualities from traces of chromium. Sapphires come in a variety of colors, which come from other impurities like iron and titanium. The hardness of different kinds of corundum makes them suitable for use as abrasives and as components in cutting tools.

Uses in Ceramics

Aluminum oxide, also called alumina, is used in engineering ceramics. It’s hard and wear-resistant, resists attacks by both acid and alkali substances, has high strength and stiffness, and has good thermal conductivity, which makes it valuable in manufacturing a variety of different ceramic products. These include things like high-temperature electrical and voltage insulators, instrumentation parts for thermal test machines, seal rings, gas laser tubes, and other laboratory equipment. Aluminum oxide is also used in the production of ballistic armor.

Other Uses

Because aluminum oxide is fairly inert chemically, white, and relatively non-toxic, it serves as filler in plastics. It’s also a common ingredient in sunscreen. Because of its hardness and strength, it’s used as an abrasive, including in sandpaper and as a less expensive substitute for industrial diamonds. Some CD and DVD polishing kits contain aluminum oxide. The same qualities make it a good ingredient in toothpaste. Dentists use aluminum oxide as a polishing agent to remove dental stains.

Aluminum oxide has a variety of different purposes. The most important one is in the manufacturing of metallic aluminum, but this is certainly not the only one. Though you might not know it, both rubies and sapphires are composed of aluminum oxide, making it a very valuable element!

Formula for Aluminum Oxide


Properties for Aluminum Oxide
Molar mass: 101.96 g·mol−1
Melting point: 2,072 °C (3,762 °F; 2,345 K)
Boiling point: 2,977 °C (5,391 °F; 3,250 K)
Density: 3.95–4.1 g/cm3

Aluminium Oxide Formula

This article deals with aluminium oxide formula. Aluminium oxide refers to a chemical compound of aluminium and oxygen. Furthermore, it is also known as alumina. Moreover, it happens to be the most commonly occurring of the aluminium oxides. Also, the compound occurs naturally in the polymorphic phase that is crystalline. It is present in some minerals like corundum and bauxite.

What is Aluminium Oxide?

Aluminium oxide happens to be a white amorphous material that is odourless. Due to its various useful properties, the compound has significant contributions in many life-extending and society-welfare applications. Furthermore, the compound is thermally unstable and insoluble. Above all, the compound serves as a starting material for the purpose of an aluminium’s metal smelting.

Derivation of Aluminium Oxide Formula

The formula of Aluminium oxide happens to be Al2O3. Aluminium oxide is an ionic compound. This is because it has a metal and a nonmetal. The metal is certainly the aluminium while oxygen is the non-metal. Furthermore, there are ionic compounds between metals and non-metals. Moreover, there is an exchange of electrons among the two atoms. Also, the metal donates electrons to the non-metal. Consequently, this results in the formation of the ionic bond.

Aluminium tends to form an ion with a charge of +3. Moreover, oxygen forms an ion with a -2 charge always. One important point to understand is that a compound’s overall charge should always be equivalent to zero or neutral. Therefore, one requires two aluminium atoms and 3 oxygen atoms so as to balance out the charge.

Moreover, when the charge gets balanced out, the compound will become neutral. Most noteworthy, this means that aluminium oxide’s formula is Al2O3. This shows two atoms of aluminium for every 3 atoms of oxygen. Corundum happens to be the most common structural form of crystalline aluminium oxide. Furthermore, the structure of corundum assumes a trigonal-like lattice form.

Physical Properties of Aluminium Oxide

First of all, aluminium oxide is an electrical insulator with high thermal conductivity, as far as a ceramic material is concerned. The compound is mostly insoluble in water and occurs mostly in crystalline form. Furthermore, the compound is pretty hard, which makes its usage effective as an abrasive and cutting tools component.

The compound is responsible for the presence of weathering resistance in metallic aluminium. Moreover, metallic aluminium happens to be extremely reactive with atmospheric oxygen. A thin layer of aluminium oxide protects the metal from oxidation and weathering. Also, a process, which goes by the name of anodizing, enhances the properties and thickness of this layer. Furthermore, the aluminium oxide that results from anodizing happens to be amorphous in nature.

There are various discharge assisted oxidation processes which result in a huge portion of the crystalline aluminium oxide in the coating. This certainly enhances its hardness. An example of a discharge assisted oxidation process is plasma electrolytic oxidation.

Chemical Properties of Aluminium Oxide

Aluminium oxide is a compound that is amphoteric. This certainly means that it can react with acids as well as bases. Furthermore, it can as an acid with a base and vice-versa, neutralizing the other. Consequently, this results in the formation of a salt.

Al2O3 + 6HF→2AIF3+3H2O

Al2O3 + 2NaOH+3H2O→2NaAl(OH)4

Uses of Aluminium Oxide

Aluminium oxide has a huge variety of uses in various fields. In the medical industry, due to its hardness, it is useful in prosthetic eye substitutes, bionic implants, and prostheses. Furthermore, its strength and lightweight makes it suitable for preparing body armours, vehicle armour, and bulletproof windows. Moreover, its high boiling and melting points make it very useful to a multitude of industrial and electrical applications.

Solved Question For Aluminium Oxide Formula

Question- What is aluminium oxide and its formula?

Answer- Aluminium oxide happens to be a chemical compound of aluminium and oxygen. Moreover, the formula of Aluminium oxide happens to be Al2O3.

How can I write the formula for aluminum oxide?

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