| Atomic Number: | 8 |
| Element Symbol: | O |
| Element Name: | Oxygen |
| Atomic Weight: | 15.9994 |
| Group Number: | 16 |
| Group Name: | Chalcogen |
| Period Number: | 2 |
| Block: | p-block |
| Ground State Configuration: | 1s2 2s2 2p4 |
| Ground State Level: | 3P2 |
| Standard State: | Gas |
| Common Valences: | 2 |
| Bond Length: | 120.741 |
| Atomic Radius Empirical: | 60 |
| Atomic Radius Calculated: | 48 |
| Covalent Radius Empirical: | 73 |
| Vander Waals Radius: | 152 |
| Electron Affinity: | 141 |
| First Ionization Energy: | 1313.9 |
| Pauling Electronegativity: | 3.44 |
| Sanderson Electronegativity: | 3.65 |
| Allred Rochow Electronegativity: | 3.50 |
| Mulliken Jaffe Electronegativity: | 3.41 |
| Allen Electronegativity: | 3.610 |
| Molar Volume: | 17.36 |
| Velocity Of Sound: | 317.5 |
| Refractive Index: | 1.000271 (gas; liquid 1.221) |
| Melting Point: | -218.3 |
| Boiling Point: | -182.9 |
| Critical Temperature: | -118.5 |
| Thermal Conductivity: | 0.02658 |
| Enthalpy Of Fusion: | 0.222 (per mol O atoms) |
| Enthalpy Of Vaporization: | 3.41 (per mole O atoms) |
| Enthalpy Of Atmization: | 249 |
| Most Common Oxidation Numbers: | -2 |
| Color: | Colourless as a gas, liquid is pale blue |
| Classification: | Non-metallic |
| Discovered By: | Joseph Priestley, Carl Scheele |
| Discovered At: | England, Sweden |
| Discovered When: | 1774 |
| Origin Of Name: | From the Greek words oxy genes meaning acid (sharp) and forming (acid former) |
Calculate the molecular weight of Oxygen or molecular weight O.
Also see the full list of chemical elements and atomic weights.