Element Oxygen

Oxygen ElementIt is the chemical element with the symbol O and atomic number 8, meaning its nucleus has 8 protons.
Oxygen is a member of the chalcogen group on the periodic table, a highly reactive nonmetal, and an oxidizing agent that readily forms oxides with most elements as well as with other compounds.
Dioxygen is used in cellular respiration and many major classes of organic molecules in living organisms contain oxygen, such as proteins, nucleic acids, carbohydrates, and fats, as do the major constituent inorganic compounds of animal shells, teeth, and bone.
Oxygen was isolated by Michael Sendivogius before 1604, but it is commonly believed that the element was discovered independently by Carl Wilhelm Scheele, in Uppsala, in 1773 or earlier, and Joseph Priestley in Wiltshire, in 1774.

Names and Identifiers

Chemical Formula:O
CAS:7782-44-7
Molecular Weight:31.99880g/mol
EC Number :231-956-9
MDL Number:MFCD00011434
Color:colourless as a gas, liquid is pale blue
Other Names:Ossigeno, Oxigênio, Syre
PubChem CID:977
IUPAC Name:Oxygen
Inchl:InChI=1S/O
InChI Key:QVGXLLKOCUKJST-UHFFFAOYSA-N
Canonical SMILES:[O]
ICSC Number:0318

Physical & Chemical Properties

Phase:Solid
Density:1.429g/L
Triple point:54.361 K, ​0.1463 kPa
Molecular Formula:O
Flash Point:n/a
Exact Mass:31.98980
Symbol:Globally Harmonized System of ClassificationGlobally Harmonized System of Classification
Signal Word:Danger
Hazard Statements:H270-H280
Precautionary Statements:n/a
Hazard Codes:O
Risk Phrases:R8
Safety Phrases:S17-S45-S36/37/39-S26-S61
RIDADR:UN 1072 2.2
WGK Germany:n/a
RTECS:RS2060000
Packaging Group:n/a
Hazard Class:2.2

All three Oxygen isotopes have medical applications. O-16 is used in the production of radioactive N-13 which is used for PET imaging and myocardial perfusion. O-17 can be used as a tracer in the study of cerebral oxygen utilization. Large quantities of O-18 are used for the production of F-18.

Naturally occurring isotopes

IsotopeMass/DaNatural abundance (atom %)Nuclear spin (I)Magnetic moment (μ/μN)
16O15.99491463 (5)99.757 (16)00
17O16.9991312 (4)0.038 (1)5/2-1.89380
18O17.9991603 (9)0.205 (14)00

Radiosotope data

IsotopeMass/DaHalf-lifeMode of decayNuclear spinNuclear magnetic moment
14O14.00859570.60 sEC to 14N0
15O15.003065122.2 sEC to 15N1/20.719
19O19.00357726.9 sβ to 19F5/2
20O20.00407613.5 sβ to 20F0
21O21.0087303.4 sβ to 21F
22O22.01012.2 sβ to 22F

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