Home 18 Ar Argon back to the periodic table
 
Atomic number   18
Symbol   Ar
Atomic weight   39.948
Density [g/l]   1.66
Melting point [°C]   -189.4
Boiling point [°C]   -185.7
1st Ionization energy [eV]   15.759
Electronic configuration   [Ne] 3s2 3p6
Oxidation number (most stable)   ---
Atomic radius [pm]   174
Ionic radius [pm]   ---
Abundance in crustal rocks [ppm]   ---
Origin of the name   (greek) argos = inactiv
Discovery   1894 by the English William Ramsay and Lord Rayleigh
Uses   as inert gas when welding as well as filler for fluorescent tubes. 
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 © 2004 Büro für angewandte Mineralogie · Dr. Stephan Rudolph · D-47918 Tönisvorst
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