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Argon

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

Ar

Kr
General
Lagyu, Symbulu, Numeru argon, Ar, 18
Chemical seriesnoble gases
Lupung, Period, Bloki 183, p
Itsuracolorless
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
(more)
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
Miscellaneous
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
References
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