Argon

Latin nameArgon
English nameArgon
chemical symbolAr
atomic number18
relative atomic mass39,948
period3
groupVIII.A
classificationnoble gases
discovery year1894
discovererW. Ramsay,
R. J. Rayleigh
melting point [°C]-189,2
boiling point [°C]-185,7
critical temperature [°C]-86,28
critical pressure [MPa]4,988
density [g cm-3]0,0017824
electronegativity [Pauling]3,9
oxidation states0
electron configuration[Ne]3s2 3p6
atomic radius [pm]71
covalent radius [pm]97
specific heat [J g-1K-1]0,52
heat of fusion [kJ mol-1]1,188
thermal conductivity [W m-1 K-1]0,01772
1. ionizing potential [eV]15,7596
2. ionizing potential [eV]27,629
3. ionizing potential [eV]40,74
state at normal conditionsgas

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