Oxygen

8 Kolevni ← oxygen → Fluor

↑
O
↓
S
Skeiðbundna skipanin
Útsjónd

Litleyst (gass)
Ljósablátt (væta)
Alment
Navn: Oxygen
Evnafrøðiligt tekn: O
Atomnummar: 8
Atommassi: 15,9994(3) g/mol
Frumevnisseria: gass
Bólkur: 16
Perioda: 2
Blokkur: p
Elektronsamanseting: 1s² 2s² 2p4
Elektronir pr. skal: 2, 6
Atomradius: 60 pm
Kovalent radius: 73 pm
Van der Waals radius: 152 pm
Evnafrøðiligir eginleikar
Oxidatiónstrin: −2, −1
Elektronegativitetur: 3,44 (Paulings skala)
Alisfrøðiligir eginleikar
Tilstandsformur: gass
Smeltipunkt: −218,79 °C
Kritiskt punkt: −118,56 °C, 5,043 MPa
Magnetiskir eginleikar: Paramagnetiskt
Mekaniskir eginleikar

Oxygen (latín oxygenium, úr grikskum ὀξύς-, oxys-, "sýra", upprunaliga "hvast", frá smakkinum á sýru, og -γενής, -genēs, "framleiðari", upprunaliga "upphav"; symbol O), er eitt frumevni, ið hevur atomnummar 8 í skeiðbundnu skipaninini. Á føroyskum verður evnið eisini nevnt súrni og súrevni av upprunaheitinum, sum meira neyvt kundi verið umsett sýruupphav. Latínska heitið kemur av, at lívrunnin evni sum t.d. fiti verða súr, tey trána, av oxygeni, og nanvgevarin, franski evnafrøðingurin Antoine Lavoisier, helt oxygen vera í øllum sýrum. Almenna danska heitið er oxygen, men heitið ilt verður eisini brúkt. Hetta seinna navnið kemur av, at oxygen nørir um eld.

Í reinari, turrari luft eru umleið 21 rúmprosent av O2.

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