›› Physical and chemical properties of Argon

Atomic Number:18
Element Symbol:Ar
Element Name:Argon
Atomic Weight:39.948
Group Number:18
Group Name:Noble gas
Period Number:3
Block:p-block
Ground State Configuration:[Ne] 3s2 3p6
Ground State Level:1S0
Standard State:Gas
Bond Length:372
Atomic Radius Calculated:71
Covalent Radius Empirical:97
Vander Waals Radius:188
First Ionization Energy:1520.6
Sanderson Electronegativity:3.31
Allred Rochow Electronegativity:3.20
Mulliken Jaffe Electronegativity:3.19
Allen Electronegativity:3.242
Molar Volume:22.56
Velocity Of Sound:319
Refractive Index:1.000281
Melting Point:-189.3
Boiling Point:-185.8
Critical Temperature:-122.2
Thermal Conductivity:0.01772
Enthalpy Of Fusion:1.18
Enthalpy Of Vaporization:6.5
Color:Colourless
Classification:Non-metallic
Discovered By:Sir William Ramsay, Lord Rayleigh
Discovered At:Scotland
Discovered When:1894
Origin Of Name:From the Greek word argos meaning inactive

Calculate the molecular weight of Argon or molecular weight Ar.

Also see the full list of chemical elements and atomic weights.