Argon

Argon or ar

• atomic number is 18

• atomic weight is 39.0983

• color is Colorless

• state at 298.15°k is Solid

• classification is Nonmetelic

• date of discovery is 1894

• density kg/m^3 is 1.784

• melting point is 83.96

• boiling point is 944 K

• group is Noble Gas

• Number of neutron is 22