Oxygen
Of great interest as the key element in the processes of respiration of most living cells and in combustion processes. It is the most abundant element in Earth's crust. About a fifth (by volume) of air is oxygen.
There are teams capable of concentrating the oxygen in the air. These are called generators, oxygen concentrators, which are used in oxygen bars.
Oxygen gas is usually not combined exist as diatomic molecules, O2, but also exists in triatomic form, O3, called ozone.
Oxygen is separated from air by liquefaction and fractional distillation. The main applications of oxygen in order of importance: 1) smelting, refining and manufacturing of steel and other metals, 2) manufacture of chemicals by controlled oxidation, 3) rocket propulsion, 4) supporting biological life and medicine and 5) mining, production and manufacture of stone and glass.
There are teams ozone generators, which are used for oxidation of materials to ozonation pool ...
In normal conditions oxygen is a colorless, odorless and tasteless, it condenses into a liquid blue. The oxygen is part of a small group of slightly paramagnetic gases, and is the paramagnetic group. Liquid oxygen is also slightly paramagnetic.
Almost all chemical elements except the inert gases form compounds with oxygen. Among the binary compounds of oxygen are more abundant water, H2O, and silica, SiO2, the main component of sand. Of the compounds containing more than two elements, the most abundant are the silicates, which constitute most of the rocks and soils. Other compounds that are abundant in nature are calcium carbonate (limestone and marble), calcium sulfate (gypsum), aluminum oxide (bauxite) and various oxides of iron, used as a source of metal.
Basic properties:
Properties |
Value |
chemical formula |
O2 |
symbol |
O |
atomic number |
8 |
electron configuration |
[He]2s22p4 |
block |
p |
group |
16 |
period |
2 |
atomic weight |
15.9994 |
Gas properties:
Properties |
Value |
term symbol |
3P2 |
atomic radius |
60 pm |
covalent radius |
66 pm |
van der Waals radius |
152 pm |