55 Cesium Cs  information about the ground-state, ionization energy, and atomic weight data
Atomic Weight:132.905 451 96(6)
Ionization Energy: 3.89390572743  eV
Ground-state Level:  2S1/2 
Ground-state Configuration: [Xe]6s 

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 Atomic Spectra Database-Lines Ground States and Ionization Energies Handbook of Basic Atomic Spectroscopic Data X-Ray Transition Energies Database
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 Atomic Transition Probability Bibliographic Database Atomic Spectral Line Broadening Bibliographic Database Atomic Energy Levels and Spectra Bibliographic Database
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