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|
Oxygen
Chemical Properties & Compounds
| Symbol | Atomic Number | Atomic Weight | Melting Point | Boiling Point | Phase | Density | Classification |
| O | 8 | 15.9994 | -218.79 °C | -182.95 °C | Gas | 1.429 g/L | Non-Metal |
|
|
|
| General |
| Name, symbol, number |
oxygen, O, 8 |
| Chemical series |
nonmetals, chalcogens |
| Group, period, block |
16, 2, p |
| Appearance |
colorless (gas)
pale blue (liquid)
 |
| Standard atomic weight |
15.9994(3) g·mol−1 |
| Electron configuration |
1s2 2s2 2p4 |
| Electrons per shell |
2, 6 |
| Physical properties |
| Phase |
gas |
| Density |
(0 °C, 101.325 kPa)
1.429 g/L |
| Melting point |
54.36 K
(-218.79 °C, -361.82 °F) |
| Boiling point |
90.20 K
(-182.95 °C, -297.31 °F) |
| Critical point |
154.59 K, 5.043 MPa |
| Heat of fusion |
(O2) 0.444 kJ·mol−1 |
| Heat of vaporization |
(O2) 6.82 kJ·mol−1 |
| Heat capacity |
(25 °C) (O2)
29.378 J·mol−1·K−1 |
|
|
| Atomic properties |
| Crystal structure |
cubic |
| Oxidation states |
−2, −1
(neutral oxide) |
| Electronegativity |
3.44 (Pauling scale) |
Ionization energies
(more) |
1st: 1313.9 kJ·mol−1 |
| 2nd: 3388.3 kJ·mol−1 |
| 3rd: 5300.5 kJ·mol−1 |
| Atomic radius |
60 pm |
| Atomic radius (calc.) |
48 pm |
| Covalent radius |
73 pm |
| Van der Waals radius |
152 pm |
| Miscellaneous |
| Magnetic ordering |
paramagnetic |
| Thermal conductivity |
(300 K) 26.58 m W·m−1·K−1 |
| Speed of sound |
(gas, 27 °C) 330 m/s |
| CAS registry number |
7782-44-7 |
| Selected isotopes |
|
|
| References |
|
Oxygen Compounds
|
Source: Wikipedia article Oxygen
|
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Chemistry Quick Facts
