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- Oxygen abstract "Oxygen is a chemical element with symbol O and atomic number 8. It is a member of the chalcogen group on the periodic table and is a highly reactive nonmetal and oxidizing agent that readily forms compounds (notably oxides) with most elements. By mass, oxygen is the third-most abundant element in the universe, after hydrogen and helium. At standard temperature and pressure, two atoms of the element bind to form dioxygen, a colorless and odorless diatomic gas with the formula O2. Diatomic oxygen gas constitutes 20.8% of the Earth's atmosphere. However, monitoring of atmospheric oxygen levels show a global downward trend, because of fossil-fuel burning. Oxygen is the most abundant element by mass in the Earth's crust as part of oxide compounds such as silicon dioxide, making up almost half of the crust's mass.Many major classes of organic molecules in living organisms, such as proteins, nucleic acids, carbohydrates, and fats, contain oxygen, as do the major inorganic compounds that are constituents of animal shells, teeth, and bone. Most of the mass of living organisms is oxygen as it is a part of water, the major constituent of lifeforms. Oxygen is used in cellular respiration and released by photosynthesis, which uses the energy of sunlight to produce oxygen from water. It is too chemically reactive to remain a free element in air without being continuously replenished by the photosynthetic action of living organisms. Another form (allotrope) of oxygen, ozone (O3), strongly absorbs UVB radiation and consequently the high-altitude ozone layer helps protect the biosphere from ultraviolet radiation, but is a pollutant near the surface where it is a by-product of smog. At even higher low earth orbit altitudes, sufficient atomic oxygen is present to cause erosion for spacecraft.Oxygen was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774, but Priestley is often given priority because his work was published first. The name oxygen was coined in 1777 by Antoine Lavoisier, whose experiments with oxygen helped to discredit the then-popular phlogiston theory of combustion and corrosion. Its name derives from the Greek roots ὀξύς oxys, \"acid\", literally \"sharp\", referring to the sour taste of acids and -γενής -genes, \"producer\", literally \"begetter\", because at the time of naming, it was mistakenly thought that all acids required oxygen in their composition. Common uses of oxygen includes the production cycle of steel, plastics and textiles, brazing, welding and cutting of steels and other metals, rocket propellant, in oxygen therapy and life support systems in aircraft, submarines, spaceflight and diving.".
- Oxygen thumbnail Philos_experiment_of_the_burning_candle.PNG?width=300.
- Oxygen wikiPageExternalLink scrippso2.ucsd.edu.
- Oxygen wikiPageExternalLink 1.
- Oxygen wikiPageExternalLink oxygen.shtm.
- Oxygen wikiPageExternalLink 008.htm.
- Oxygen wikiPageExternalLink element.asp.
- Oxygen wikiPageExternalLink CIIE_oxygen_48k_tcm18-117681.mp3.
- Oxygen wikiPageExternalLink oxygen.html.
- Oxygen wikiPageExternalLink index.html.
- Oxygen wikiPageID "22303".
- Oxygen wikiPageLength "99414".
- Oxygen wikiPageOutDegree "585".
- Oxygen wikiPageRevisionID "702871110".
- Oxygen wikiPageWikiLink 1,4-Dioxane.
- Oxygen wikiPageWikiLink Absorption_band.
- Oxygen wikiPageWikiLink Abundance_of_the_chemical_elements.
- Oxygen wikiPageWikiLink Acetamide.
- Oxygen wikiPageWikiLink Acetic_acid.
- Oxygen wikiPageWikiLink Acetic_anhydride.
- Oxygen wikiPageWikiLink Acetone.
- Oxygen wikiPageWikiLink Acetylene.
- Oxygen wikiPageWikiLink Acid.
- Oxygen wikiPageWikiLink Adenine.
- Oxygen wikiPageWikiLink Adenosine_diphosphate.
- Oxygen wikiPageWikiLink Adenosine_triphosphate.
- Oxygen wikiPageWikiLink Adhesive.
- Oxygen wikiPageWikiLink Aerobic_organism.
- Oxygen wikiPageWikiLink Air_pollution.
- Oxygen wikiPageWikiLink Aircraft.
- Oxygen wikiPageWikiLink Airglow.
- Oxygen wikiPageWikiLink Alcohol.
- Oxygen wikiPageWikiLink Aldehyde.
- Oxygen wikiPageWikiLink Alexander_von_Humboldt.
- Oxygen wikiPageWikiLink Allotropes_of_oxygen.
- Oxygen wikiPageWikiLink Allotropy.
- Oxygen wikiPageWikiLink Aluminium.
- Oxygen wikiPageWikiLink Aluminium_oxide.
- Oxygen wikiPageWikiLink Amedeo_Avogadro.
- Oxygen wikiPageWikiLink American_football.
- Oxygen wikiPageWikiLink Amide.
- Oxygen wikiPageWikiLink Amino_acid.
- Oxygen wikiPageWikiLink Anaerobic_organism.
- Oxygen wikiPageWikiLink Ancient_Greece.
- Oxygen wikiPageWikiLink Ancient_Greek.
- Oxygen wikiPageWikiLink Animal.
- Oxygen wikiPageWikiLink Antibonding_molecular_orbital.
- Oxygen wikiPageWikiLink Antifreeze.
- Oxygen wikiPageWikiLink Antimony.
- Oxygen wikiPageWikiLink Antoine_Lavoisier.
- Oxygen wikiPageWikiLink Apollo_(spacecraft).
- Oxygen wikiPageWikiLink Apollo_1.
- Oxygen wikiPageWikiLink Archaea.
- Oxygen wikiPageWikiLink Arterial_blood_gas.
- Oxygen wikiPageWikiLink Artery.
- Oxygen wikiPageWikiLink Arthropod.
- Oxygen wikiPageWikiLink Asphalt.
- Oxygen wikiPageWikiLink Atmosphere_of_Earth.
- Oxygen wikiPageWikiLink Atomic_mass.
- Oxygen wikiPageWikiLink Atomic_number.
- Oxygen wikiPageWikiLink Atomic_orbital.
- Oxygen wikiPageWikiLink Atomic_theory.
- Oxygen wikiPageWikiLink Auburn,_Massachusetts.
- Oxygen wikiPageWikiLink Aufbau_principle.
- Oxygen wikiPageWikiLink Aurora.
- Oxygen wikiPageWikiLink Autoxidation.
- Oxygen wikiPageWikiLink Avogadros_law.
- Oxygen wikiPageWikiLink Bacteria.
- Oxygen wikiPageWikiLink Banded_iron_formation.
- Oxygen wikiPageWikiLink Barbecue.
- Oxygen wikiPageWikiLink Bauxite.
- Oxygen wikiPageWikiLink Beta_decay.
- Oxygen wikiPageWikiLink Biochemical_oxygen_demand.
- Oxygen wikiPageWikiLink Biogeochemical_cycle.
- Oxygen wikiPageWikiLink Biomolecule.
- Oxygen wikiPageWikiLink Biosphere.
- Oxygen wikiPageWikiLink Bohr_effect.
- Oxygen wikiPageWikiLink Bond_order.
- Oxygen wikiPageWikiLink Breathing.
- Oxygen wikiPageWikiLink Breathing_gas.
- Oxygen wikiPageWikiLink CNO_cycle.
- Oxygen wikiPageWikiLink Calcium_carbonate.
- Oxygen wikiPageWikiLink Calcium_phosphate.
- Oxygen wikiPageWikiLink California.
- Oxygen wikiPageWikiLink Calx.
- Oxygen wikiPageWikiLink Cambrian.
- Oxygen wikiPageWikiLink Carbohydrate.
- Oxygen wikiPageWikiLink Carbon.
- Oxygen wikiPageWikiLink Carbon_cycle.
- Oxygen wikiPageWikiLink Carbon_dioxide.
- Oxygen wikiPageWikiLink Carbon_monoxide.
- Oxygen wikiPageWikiLink Carbon_monoxide_poisoning.
- Oxygen wikiPageWikiLink Carboniferous.
- Oxygen wikiPageWikiLink Carbonyl.
- Oxygen wikiPageWikiLink Carboxylic_acid.
- Oxygen wikiPageWikiLink Carl_Wilhelm_Scheele.
- Oxygen wikiPageWikiLink Carl_von_Linde.
- Oxygen wikiPageWikiLink Carotene.
- Oxygen wikiPageWikiLink Carotenoid.
- Oxygen wikiPageWikiLink Cascade_(chemical_engineering).