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# What is the chemical formula for oxygen?

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According to the National Center for Biotechnology Information, the chemical formula for oxygen is O2. The O stands for the oxygen molecule, while the 2 represents the need for two oxygen molecules to form the element.

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O2 is also known as molecular oxygen, dioxygen, hyperoxia and pure oxygen. NCBI states that oxygen is "the most abundant element on earth and essential for respiration." Oxygen has the atomic symbol O, the atomic number 8 on the periodic table and an atomic weight of 15.99903; 15.99977. The two-dimensional structure of oxygen is represented by "o=o," which shows the two oxygen molecules connected to form an element.

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The chemical formula for beryllium iodide is BeI2. Beryllium iodide attracts and holds water molecules, and it reacts violently with them to form hydrolodic acid. It can also be used in preparing high-purity beryllium through decomposing it on a hot tungsten filament.

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The chemical formula for magnesium oxide is MgO. It is an inorganic compound found in nature in the mineral periclase. Its atomic weight is 40.3044 grams per mole.

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The chemical formula for silicon dioxide, also called silica, is SiO2. Silicon and oxygen are two of the most abundant elements in the Earth's crust, with silica composing 59 percent. When exposed to oxygen, silicon surfaces oxidize to form the compound SiO2.