Technical data for Oxygen

Overview
NameOxygen
SymbolO
Atomic Number8
Atomic Weight15.9994
Density1.429 g/l[note]
Melting Point-218.3 °C
Boiling Point-182.9 °C

Thermal properties
PhaseGas
Melting Point-218.3 °C
Boiling Point-182.9 °C
Absolute Melting Point54.8 K
Absolute Boiling Point90.2 K
Critical Presure5.043 MPa (49.77 Atm)
Critical Temperature154.59 K
Heat of Fusion0.222 kJ/mol
Heat of Vaporization3.41 kJ/mol
Heat of CombustionN/A
Specific Heat919 J/(kg K)[note]
Adiabatic Index7/5
Thermal Conductivity0.02658 W/(m K)
Thermal ExpansionN/A

Bulk physical properties
Density1.429 g/l[note]
Density (Liquid)N/A
Molar Volume0.011196
Refractive Index1.000271
Speed of Sound317.5 m/s
Thermal Conductivity0.02658 W/(m K)
Thermal ExpansionN/A

Reactivity
Valence2
Electronegativity3.44
ElectronAffinity141 kJ/mol
Ionization Energies
1313.9, 3388.3, 5300.5, 7469.2, 10989.5, 13326.5, 71330, 84078 kJ/mol

Health and Safety
Autoignition PointN/A
FlashpointN/A
Heat of CombustionN/A

Classifications
Alternate NamesNone
Nams of Allotropes
Dioxygen, Ozone, Tetraoxygen
Blockp
Group16
Period2
Electron Configuration[He]2s22p4
ColorColorless
Discovery
1774 in Sweden and United Kingdom
Gas phaseDiatomic
CAS NumberCAS7782-44-7

Electrical properties
Electrical TypeN/A
Electrical ConductivityN/A
ResistivityN/A
Superconducting PointN/A

Magnetic properties
Magnetic TypeParamagnetic
Curie PointN/A
Mass Magnetic Susceptibility1.335×10-6
Molar Magnetic Susceptibility2.13592×10-8
Volume Magnetic Susceptibility1.90772×10-6

Abundances
% in Universe1%
% in Sun0.9%
% in Meteorites40%
% in Earth's Crust46%
% in Oceans86%
% in Humans61%

Atomic dimensions and structure
Atomic Radius48 pm
Covalent Radius73 pm
Van der Waals Radius152 pm
Crystal StructureBase Centered Monoclinic
Lattice Angles
π/2, 2.313085, π/2
Lattice Constants
540.3, 342.9, 508.6 pm
Space Group NameC12/m1
Space Group Number12

Nuclear Properties
Half-LifeStable
LifetimeStable
Stable Isotopes
16O, 17O, 18O
Isotopic Abundances
16O99.757%
17O0.038%
18O0.205%

Notes on the properties of Oxygen:
Density: Density given for O at 0° Celsius. 2
Specific Heat: Value given for gas phase of O . 2