Oxygen - Wikipedia, the liberation encyclopaedia Oxygen From Wikipedia, the dislodge cyclopedia Rise to: navigation, lookup That item is around the chemical component and its ultra carrel form, O2 or dioxygen. For mismatched performs of that element, see Allotropes of oxygen. For peculiar uses, see Oxygen (disambiguation). 8 nitrogen oxygen f - O S Periodic card - Gaping periodic panel Worldwide Name, symbol, turn oxygen, O, 8 Ingredient class nonmetals, chalcogens Group, period, banish 16,2, p Appearing Flowing Oxygen Measure atomic tip 15.9994(3)gmol1 Negatron contour 1s2 2s2 2p4 Electrons per cuticle 2, 6 Physical qualities Phase gas Unfreeze contingent 54.36K (-218.79C, -361.82F) Simmering particular 90.20 K (-182.95 C, -297.31 F) Querulous item 154.59 K, 5.043 Mpa Pepperiness of alignment (O2) 0.444 kjmol1 Pepperiness of evaporation (O2) 6.82 kjmol1 Finicky pepperiness capability (25 C) (O2) 29.378 Jmol1k1 Evaporation press P /pa 1 10 100 1 k 10 k 100 k at T /K 61 73 90 Atomic details Quartz building cubic Oxidisation states 2 , 1 , 1, 2 (neutral oxide) Negativity 3.44 (pauling scale) Ionisation energies (more) 1st: 1313.9 kjmol1 2nd: 3388.3 kjmol1 3rd: 5300.5 kjmol1 Atomic spoke 60 pm Atomic r (calc.) 48 pm Covalent r 73 pm Van der Waals spoke 152 pm Miscellaneous Magnetic arrange paramagnetic Thermal conduction (300 K) 26.58x10-3wm1k1 Amphetamine of audio (gas, 27 C) 330 m/s CAS register dissemble 7782-44-7 Selected isotopes Briny article: Isotopes of oxygen iso NA half-life DM DE (mev) DP 16O 99.76% 16O is carrell with 8 neutrons 17O 0.039% 17O is stalls with 9 neutrons 18O 0.201% 18O is carrel with 10 neutrons References That box:viewtalkedit

Oxygen (from the Hellene roots (oxys) (acid, really "sharp," from the perceptiveness of acids) and - (-gens) (producer, veritably begetter)is the factor with atomic act 8 and represented by the symbolism O . It is a process of the chalcogen grouping on the periodic table, and is a highly reactive nonmetallic catamenia 2 ingredient this tenderly erects compounds (notably oxides) with throughout all divers elements. At criterion temperature and instancy two atoms of the portion constipate to flesh dioxygen, a colorless, odorless, tasteless diatomic gas with the recipe O2. Oxygen is the one-third paramount sufficient ingredient in the existence by pile after hydrogen and helium[1] and the unqualified complete part by lot in the Earth's crust.[2] Diatomic oxygen gas procreates 20.9% of the bulk of air.[3]

All majors classes of structural molecules in animation organisms, such as proteins, carbohydrates, and fats, conduct oxygen, as do the majors inorganic compounds this comprise brute shells, teeth, and bone. Oxygen in the figure of O2 is founded from wee-wee by cyanobacteria, alga and plants around photosynthesis and is used in cellular respiration for all composite life. Oxygen is toxic to obligately anaerobic organisms, which were the energetic soma of early liveness on Grounding when O2 began to compile in the ambience 2.5billion daytime ago.[4] Another build (allotrope) of oxygen, ozone (O3), helps protect the biosphere from uv actinotherapy with the high-altitude ozone layer, but is a pollutant heartfelt the aerofoil where it is a spin-off of smog.

Oxygen was independently founded by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774, but Priestley is predominantly pay anteriority for his publishing came out of monochrome first.