Chemistry Of Oxygen

Physical properties Formula O2

Atomic number Z = 8

Molar mass 31,999

Volumic mass 1.429kg.m-3

Boiling point -182.97°C

Oxygen is the eighth element of the periodic table of elements. Its most wide-spread isotope is 16O, which means that its nucleus is constituted by eight protons and eight neutrons. There are two other rare oxygen isotopes: 17O and 18O. Oxygen is a member of group VI according to the periodic table of the elements, which means that it possesses on its external electronic layer six electrons, which renders it avid for two supplementary electrons and explains its properties of electro-negativity. Like the other elemental gases as hydrogen or nitrogen, oxygen appears in the natural state as a molecule of dioxygen O2 by pooling a pair of electrons between the 2 atoms of oxygen. Thus, the molecule of O2 possesses a global electronic deficit of two electrons, which exists in form of two unpaired electrons under normal conditions (e.g., room temperature, normobaria, not irradiated). Oxygen usually reacts as a bi-radicals (*O-O*).

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