Science Periodic Table - Elements - Argon Symbol Ar Atomic Number 18 Relative Atomic Mass 12C = 12.0000 39.948 Atomic Radius pm 174 First Ionisation Energy kJ mol-1 1520.4 Electronegativity n/a Density kg m-3 1656 [40 K] 1380 [b.p.] 1.784 [273 K] Molar Volume cm3 24.12 [40K] Thermal Conductivity W m-1 K-1 0.0177 [300 K] Melting Point K 83.78 Boiling Point K 87.29 Number of Isotopes 15 Ground State Electron Configuration [Ne]3s23p6 = [Ar] Term Symbol 1S0 Discovery Discovered by Lord Rayleigh (London, England) and Sir W. Ramsey (Bristol, England) in 1894 Name Derived From Greek argos meaning 'inactive' Name in Other Languages  Croatian Argon  Danish argon  Dutch argon  Finnish argon  French argon  German Argon  Italian argo  Norwegian argon  Portuguese árgon  Spanish argón  Swedish argon Peter van der Krogt's Element Multidict - element name translations in over 48 langauges

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