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Ar
in WebElements
in X-Ray info
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Ar, 18
argon (English)
argon, m. (French)
Argon, n. (German)
argon (Russian)
argón (Spanish)
argon (Swedish)
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| Symbol, number | Ar, 18 (noble gas), Group: 18; 8A |
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| Weight | 39.948 |
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| In Nature | |
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| Discovered | 1894, by Lord Rayleigh and Sir William Ramsay (England) |
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| Density [kg/m3] | 1656 [40 K] (solid) 1380 [87 K] (liquid) 1.784 [273 K] (gas) |
| Molar volume | 24.12 [40 K] cm3 |
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| Melting Temperature | 83.78 K (-189.22 °C) Enthalpy: 6.53 kJ/mol |
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| Boiling Temperature | 87.29 K (-185.71 °C) Enthalpy: 1.21 kJ/mol |
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| Thermal | Conductivity: 0.0177 [300 K] (gas) W/Km |
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| Configuration | 1s2 2s2p6 3s2p6 |
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| Ionisation [kJ/mol] |
| M--> |
M+--> |
M2+--> |
M3+--> |
M4+--> |
M5+--> |
M6+--> |
M7+--> |
M8+--> |
M9+-->M10+ |
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| Thermodynamics |
| State |
DfH° |
DfG° |
S° |
CpH |
H°298.15-H°0 |
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[J/Kmol] |
[kJ/mol] |
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| Isotopes |
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Mass |
In nature |
Half-life |
Spin |
m/mN |
NMM |
Decay |
| Ar |
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