Oxygeno: Elemento chimic con numero atomic 8
Oxygeno (symbolo O) es le elemento chimic de numero atomic 8.
In su forma molecular, O2, illo es un gas a temperatura ambiente. Illo representa circa 20% del composition del atmosphera terrestre.
| Nitrogeno ← Oxygeno → Fluor | |
| Apparentia | |
 | |
| gas incolor; liquido blau pallide | |
| Proprietates atomic | |
| Nomine, symbolo, numero | Oxygeno, O, 8 |
| Serie chimic | nonmetallo |
| Gruppo, periodo, bloco | 16, 2, p |
| Configuration electronic | [He] 2p4 |
| Electronegativitate | 3,44 |
| Proprietates physic | |
| Stato | gas |
| Massa molar | 15,9994 g·mol−1 |
| Densitate | 1,429 g/L (0 °C, 101,325 kPa) |
| Densitate liquide al p.e. | 1,141 g·cm−3 |
| Puncto de fusion | 54,36 K, -218,79 °C, -361.82 °F |
| Puncto de ebullition | 90,20 K, -182,95 °C, -297.31 °F |
| Puncto triple | 54,361 K, 0,152 kPa |
| Puncto critic | 154,59 K, 5,043 MPa |
| Calor de fusion | (O2) 0,444 kJ·mol−1 |
| Calor de vaporisation | (O2) 6,82 kJ·mol−1 |
| Calor specific | (25 °C, O2) 29,378 J·mol−1·K−1 |
| Conductivitate thermal | 26,58×10-3 W·m−1·K−1 |
| Velocitate de sono | (gas, 27 °C) 330 m·s−1 |
| Valores in unitates SI e in le conditiones normal del material (25 °C, 100 kPa) si non indica al contrario. | |
Oxygeno es un del elementos le plus importante del chimia organic e participa de forma multo importante in le cyclo energetic del esseres vive. Tote le gasose oxygeno terren es produite per le flora via le processo de photosynthese e illo consummate per le fauna via le processo de respiration. Secundo le biologos, le presentia de tal oxygeno a un planeta esserea un signo forte que il ha vita illac.
Illo es un gas incolor, inodor e insipide.
Il etiam existe un forma molecular formate de tres atomos de oxygeno, O3, denominate ozono.
Un atomo de oxygeno combinate con duo de hydrogeno forma un molecula de aqua (H2O).
Referentias
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