Argon

Noble gas

Symbol: Ar

Atomic Number: 18

Standard State: Gas

Atomic Mass: 39.9

Electron Configuration: [Ne]3s2 3p6

Electronegativity:

Atomic Radius: 188

Ionization Energy: 15.76

Melting Point: 83.8

Boiling Point: 87.3

Density: 0.001784

Year Discovered: 1894