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Also known as element 8, oxygen atom, ₈O, Oxygen, E948

Oxygen is a chemical element; it has the symbolO and its atomic number is8. It is a member of the chalcogen group in the periodic table. It is highly reactive, a nonmetal, and a potent oxidizing agent that readily forms oxides with most elements as well as with other compounds. Oxygen is the most abundant element in Earth's crust, making up almost half of the Earth's crust in the form of various oxides such as water, carbon dioxide, iron oxides, and silicates. It is also the third-most abundant element in the universe after hydrogen and helium.

OverviewAI-generated

Oxygen is a chemical element with the symbol O and atomic number 8. It has an atomic mass of 15.999 and an electronegativity of 3.44. The element exhibits oxidation states of -2, -1, 1, and 2. Its electron configuration is 1s² 2s² 2p⁴, and it belongs to period 2 and group 16. Oxygen is classified as a lithophile and is a component of water.

The element was discovered in 1774 in Calne and Sweden by Carl Wilhelm Scheele and Joseph Priestley. It is named after acid and is the opposite of phlogiston. Oxygen has an ionization energy of 7469.2 and a radius of 152. It is described by sources including the Armenian Soviet Encyclopedia, Brockhaus and Efron Encyclopedic Dictionary, The Nuttall Encyclopædia, and the Encyclopædia Britannica 11th edition.

Synthesized by Vinony from 25 facts across 3 sources: Wikidata, PubMed, Vinony graph. Generated from structured data (not the Wikipedia text) and checked against those facts — may still contain errors.

Research

1,024,644 papers

[Oxygen therapy of patients with chronic obstructive bronchitis and pulmonary emphysema (review of the foreign literature)].ReviewKlinicheskaia meditsina · 1984Chuchalin AG, Aleksandrov OV
Problems with equipment in oxygen therapy.ReviewInternational anesthesiology clinics · 1982Geiger K, Hedley-Whyte J
A New Multifunction Oxygenator With a Dual-Chamber Gas Exchanger to Reduce Dependence on Oxygen Supply.ASAIO journal (American Society for Artificial Internal Organs : 1992) · 2025Han D, Zhang J, Shah A et al.DOI: 10.1097/MAT.0000000000002396
Computational Modeling of Oxygen Transfer in Artificial Lungs.Artificial organs · 2018Kaesler A, Rosen M, Schmitz-Rode T et al.DOI: 10.1111/aor.13146
Oxygen permeability of carbon-surfaced microporous membranes.Journal of biomedical materials research · 1980Borovetz HS, Mateer DD, Hardesty RL et al.DOI: 10.1002/jbm.820140205
Follow the Oxygen: Comparative Histories of Planetary Oxygenation and Opportunities for Aerobic Life.Astrobiology · 2019Ward LM, Stamenković V, Hand K et al.DOI: 10.1089/ast.2017.1779
The double-capillary-oxygenator.Transactions - American Society for Artificial Internal Organs · 1972Clevert HD, Mohnhaupt R, Affeld K et al.DOI: 10.1097/00002480-197201000-00096
Intravascular oxygenation.ReviewPerfusion · 1994Wheeldon DDOI: 10.1177/026765919400900305

Wikidata facts

Instance of: lithophile
Subclass of: nonmetal
Part of: water
Named after: acid
Radius: 48
Mass: 15.999
Image: Liquid oxygen in a beaker 4.jpg
Has use: food additive

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oxidation state: 1
atomic number: 8
element symbol: O
topic's main category: Category:Oxygen
Commons category: Oxygen
discoverer or inventor: Joseph Priestley
electronegativity: 3.44
Commons gallery: Oxygen
described by source: Encyclopædia Britannica 11th edition
time of discovery or invention: 1774-00-00
location of discovery: Sweden
on focus list of Wikimedia project: Wikipedia:Vital articles/Level/4
opposite of: phlogiston
Unicode character: 氧
electron configuration: [He] 2s² 2p⁴
ionization energy: 5300.5
different from: dioxygen
ionic radius: 1.40
frequency: 60
maintained by WikiProject: WikiProject Biology
chemical formula: O

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