O2, or molecular oxygen, is a diatomic molecule consisting of two oxygen atoms bonded together by a covalent bond. The two atoms share a total of four electrons, two from each atom, to form the bond. The molecule has a linear shape and is colorless, odorless, and tasteless in its gaseous state. O2 is essential for respiration in living organisms and is involved in many chemical reactions. It is also a major component of the Earth's atmosphere.
At the molecular level, O2 refers to a molecule composed of two oxygen atoms bonded together. These atoms are joined by a covalent double bond, which means they share four electrons. This double bond is formed by the overlap of the atomic orbitals of each oxygen atom. The O2 molecule is colorless, odorless, and tasteless gas and is the most stable and abundant form of oxygen in the Earth's atmosphere.
