18 Argon Ar  information about the ground-state, ionization energy, and atomic weight data
Atomic Weight:39.948(1)
Ionization Energy: 15.7596119  eV
Ground-state Level:  1S0 
Ground-state Configuration: [Ne]3s23p6 

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 Atomic Spectra Database-Lines Atomic Spectra Database-Levels Ground States and Ionization Energies Handbook of Basic Atomic Spectroscopic Data X-Ray Transition Energies Database Spectrum of Th-Ar Hollow Cathode Lamps
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