Oxygen

Nonmetal

Symbol: O

Atomic Number: 8

Standard State: Gas

Atomic Mass: 15.999

Electron Configuration: [He]2s2 2p4

Electronegativity: 3.44

Atomic Radius: 152

Ionization Energy: 13.618

Melting Point: 54.36

Boiling Point: 90.2

Density: 0.001429

Year Discovered: 1774