| O | Oxygen | Atomic number : 8 Relative atomic mass (12C = 12.0000) : 15.9994 |
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| P H Y S I C A L D A T A | |
| Group 16 non-metal Density / kg m-3 : 2000 [s., m.p.]; 1140 [liq., b.p.]; 1.429 [gas, 273 K] |
Melting point / K : 54.8 Boiling point / K : 90.188 |
| D I S C O V E R Y | |
| Oxygen was discovered in 1774 by J. Priestley at Leeds, England, and independently by C.W. Scheele at Uppsala, Sweden. |
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| G E O L O G I C A L D A T A | |
| Abundances Sun (relative to H = 1 × 1012) : 6.92 × 108 Earth's crust / p.p.m. : 474 000 Atmosphere / p.p.m. (volume) : 209 500 |
Seawater / p.p.m. : constituent element of water |
| B I O L O G I C A L D A T A | |
| Level in humans Blood / mg dm-3 : constituent of water Bone / p.p.m. : 285 000 Liver / p.p.m. : 160 000 Muscle / p.p.m. : 160 000 |
Daily dietary intake : mainly as water Total mass of element in average (70 kg) person : 43 kg, mainly as water |
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A portrait of oxygen is available on the Visual Elements site. Up to 200 individual items of information on this element are available in The Elements. |