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Contents
1
Characteristics
1.1
Structure
1.2
Allotropes
1.3
Physical properties
1.4
Isotopes and stellar origin
1.5
Occurrence
2
Biological role
2.1
Photosynthesis and respiration
2.2
Build-up in the atmosphere
3
History
3.1
Early experiments
3.2
Phlogiston theory
3.3
Discovery
3.4
Lavoisier's contribution
3.5
Later history
4
Industrial production
5
Applications
5.1
Medical
5.2
Life support and recreational use
5.3
Industrial
5.4
Scientific
6
Compounds
6.1
Oxides and other inorganic compounds
6.2
Organic compounds and biomolecules
7
Safety and precautions
7.1
Toxicity
7.2
Combustion and other hazards
8
See also
9
Notes and citations
10
References
11
Further reading
12
External links
Oxygen
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This article is about the chemical element and its most stable form,
O
2
or dioxygen. For other forms of this element, see
Allotropes of oxygen
. For other uses, see
Oxygen (disambiguation)
.
nitrogen
←
oxygen
→
fluorine
-
↑
O
↓
S