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This article pertains to the chemical element. For other uses, see argon (disambiguation).
18 chlorineargonpotassium


Lagyu, Symbulu, Numeru argon, Ar, 18
Chemical seriesnoble gases
Lupung, Period, Bloki 183, p
Standard atomic weight 39.948(1) g·mol−1
Electron configuration [Ne] 3s2 3p6
Electrons per shell 2, 8, 8
Physical properties
Phasegas (At room temperature)
Density(0 °C, 101.325 kPa)
1.784 g/L
Melting point83.80 K
(-189.35 °C, -308.83 °F)
Boiling point87.30 K
(-185.85 °C, -302.53 °F)
Triple point83.8058 K, 69 kPa
Critical point150.87 K, 4.898 MPa
Heat of fusion1.18 kJ·mol−1
Heat of vaporization6.43 kJ·mol−1
Heat capacity(25 °C) 20.786 J·mol−1·K−1
Vapor pressure
P/Pa 1 10 100 1 k 10 k 100 k
at T/K   47 53 61 71 87
Atomic properties
Crystal structurecubic face centered
Oxidation states0
Electronegativityno data (Pauling scale)
Ionization energies
1st: 1520.6 kJ·mol−1
2nd: 2665.8 kJ·mol−1
3rd: 3931 kJ·mol−1
Atomic radius71 pm
Atomic radius (calc.)71 pm
Covalent radius97 pm
Van der Waals radius188 pm
Magnetic orderingnonmagnetic
Thermal conductivity(300 K) 17.72 m W·m−1·K−1
Speed of sound(gas, 27 °C) 323 m/s
CAS registry number7440-37-1
Selected isotopes
Main article: Isotopes of argon
iso NA half-life DM DE (MeV) DP
36Ar 0.337% Ing Ar stable ya kambe ning 18 neutrons
37Ar syn 35 d ε ? 37Cl
38Ar 0.063% Ing Ar stable ya kambe ning 20 neutrons
39Ar syn 269 y β- 0.565 39K
40Ar 99.600% Ing Ar stable ya kambe ning 22 neutrons
41Ar syn 109.34 min β- 2.49 41K
42Ar syn 32.9 y β- 0.600 42K
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