8
16.00
O
Oxygen
Identification
CAS Number: 7782-44-7
Discovery Year: 1774
Discoverer: Joseph Priestly, Carl Wilhelm Scheele
Discovery Location: England/Sweden
Properties
Atomic Mass: 15.999 →Density: 0.0013080000000000001 g/cm³ →
Crust Abundance: 461000 mg/kg
Crystal Structure: CUB
Atomic Dimensions
Atomic Radius: 60 pm →
Atomic Radius (Rahm): 171 pm
Covalent Radius: 66 pm →Van der Waals Radius: 152 pm
Atomic Volume: 14 cm³/mol
Lattice Constant: 6.83 Å
Thermodynamics
Melting Point: 54.8 K →Boiling Point: 90.19 K →Thermal Conductivity: 0.027 W/(m·K) →
Heat of Formation: 249.229 kJ/mol
Electronic Structure
Electron Config: [He] 2s2 2p4
Block: p
Period: 2 →Group: 16 →Electronegativity: 3.44 →Electron Affinity: 1.4611135 eV →Oxidation States: -2
Abundance & Geochemistry
Crust Abundance: 461000 mg/kg
Sea Abundance: 857000 mg/L
Geochemical Class: major
Goldschmidt Class: litophile
About
Oxygen is essential for respiration in most living organisms. It makes up about 21% of Earth's atmosphere and is necessary for combustion.
Isotopes
O-16 16 99.74%
O-18 18 0.2220%
O-17 17 0.0400%