General | States | Energies | Oxidation & Electrons |Appearance & Characteristics
Reactions | Other Forms |Radius | Conductivity | Abundance
Encyclopedia Britannica articles


Name Oxygen Symbol O
atomic number 8 Atomic weight 15.9994
Density @ 293 K 0.001429 g/cm3 Atomic volume 14.0 cm3/mol
Group Non-Metal, Chalcogen discovered 1774


state (s, l, g) g
melting point 54.8 K boiling point 90.2 K
Heat of fusion 0.22259 kJ/mol Heat of vaporization 3.4099 kJ/mol
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1st ionization energy 1313.9 kJ/mole electronegativity 3.44
2nd ionization energy 3388.2 kJ/mole electron affinity 140.97875 kJ/mole
3rd ionization energy 5300.3 kJ/mole Specific heat 0.92 J/gK
heat atomization 249 kJ/mole atoms

Oxidation & Electrons

Shells 2,6 electron configuration [He] 2s2 2p4
minimum oxidation number -2 maximum oxidation number 2
min. common oxidation no. -2 max. common oxidation no. 0
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Appearance & Characteristics

structure color colorless
uses rocket fuel, steel mfr. toxicity no
hardness mohs characteristics diatomic,2 forms: O2, O3


reaction with air none reaction with 6M HCl none
reaction with 6M HCl none reaction with 15M HNO3 none
reaction with 6M NaOH none
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Other Forms

number of isotopes 3 hydride(s) H2O
oxide(s) O2 O3 chloride(s) Cl2O ClO2 Cl2O7


ionic radius (2- ion) 126 pm ionic radius (1- ion) pm
atomic radius 73 pm ionic radius (1+ ion) pm
ionic radius (2+ ion) pm ionic radius (3+ ion) pm
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thermal conductivity 0.03 J/m-sec-deg electrical conductivity 0 1/mohm-cm
polarizability 0.793 A^3


source Air rel. abund. solar system 7.377 log
abundance earth's crust 5.7 log cost, pure 0.3 $/100g
cost, bulk $/100g
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World Wide Web presentation of Chemicool Periodic Table is © Copyright 1996-99 by David D. Hsu. Some data were provided by and used with the permission of JCE Software and is owned and copyright by the Division of Chemical Education, Inc. Additional data were provided by Perkin-Elmer through Peter Lykos of IIT. The information may not be redistributed without the permission of David Hsu or JCE Software.