Oxygen

Synonyms: None

Symbol: O

Atomic mass: 15.9994 g/mol

Element number 8 in the Periodic Table. Valence number: 2. Electronegativity: 3.4

MP= -218.4^o C; BP= -183^o C; CAS-number: 7782-44-7 (dioxygen O₂);

Oxygen exists in two allotropic forms as dioxygen O₂ and trioxygen (ozone) O₃. Oxygen is a reactant in many biochemical reactions e.g. oxygenases, purine degradation, catalase, photosynthesis, electron transport and formation of peroxides. Oxygen is used as a packaging gas in the food industry and has the E-number E 948.

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