18
39.948 u
Ar
Argon
Noble Gas
Atomic Structure
Physical State
Group
18
Period
3
Block
p
Electron Configuration
[Ne] 3s² 3p⁶
Physical Properties
Atomic Mass:
39.948 u
Electronegativity:
N/A
Atomic Radius:
188 pm
Ionization Energy:
15.76 eV
Density:
0.0017837 g/cm³
Melting Point:
83.8 K
Boiling Point:
87.3 K
Historical Information
Discovered By:
Lord Rayleigh
Year Discovered:
1894