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Oxygen


2
8
15.9994
KEY
Chemical Element Symbol Key

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Oxygen
Columbia Encyclopedia
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Symbol: O
Atomic Number: 8
Atomic Weight: 15.9994
Element Classification: Non-Metal
Discovered By: Joseph Priestly, Carl Wilhelm Scheele
Discovery Date: 1774 (England/Sweden)
Name Origin: Greek: oxys and genes, (acid former).
Density (g/cc): 1.149 (@ -183°C)
Melting Point (K): 54.8
Boiling Point (K): 90.19
Appearance: Colorless, odorless, tasteless gas; pale blue liquid
Atomic Radius (pm): n/a
Atomic Volume (cc/mol): 14.0
Covalent Radius (pm): 73
Ionic Radius: 132 (-2e)
Specific Heat (@20°C J/g mol): 0.916 (O-O)
Fusion Heat (kJ/mol): n/a
Evaporation Heat (kJ/mol): n/a
Thermal Conductivity (@25°C W/m K):
Debye Temperature (K): n/a
Pauling Negativity Number: 3.44
First Ionizing Energy (kJ/mol): 1313.1
Oxidation States: -2, -1
Electronic Configuration: [He] 2s2 2p4
Lattice Structure: Cubic (CUB
Lattice Constant (Å): 6.830
Lattice C/A Ratio: n/a


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