Argon (Ar)
Atomic number
18
Mass number
40
Electronegativity
0.0
Covalent radius
0.98
Atomic radius
0.88
Melting point
83.81
Boiling point
87.3
Density
0.001784
Specific heat
0.520
Electrical conductivity
0.0
Thermal conductivity
0.0001772