Oxygen

Reactive Nonmetal

Oxygen (O) is element 8, a reactive nonmetal, in period 2 and group 16 of the periodic table. Its standard atomic weight is 15.999, it melts at -218.79 °C and boils at -182.96 °C. Discovered by Joseph Priestley, 1774.

Atomic Number8

SymbolO

NameOxygen

Atomic Weight15.999 u

CategoryReactive Nonmetal

Period2

Group16

Melting Point-218.79 °C

Boiling Point-182.96 °C

Density0.001308 g/cm³

Electron Config[He] 2s2 2p4

Discovered ByJoseph Priestley, 1774

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