55 - Cesium (Cs)  information about the ground-state, ionization energy, and atomic weight data
Atomic Weight: 132.90545(2)
Ionization Energy: 3.8939 eV
Ground-state Level: 2S1/2
Ground-state Configuration: [Xe] 6s

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 Atomic Spectra Database-Lines Handbook of Basic Atomic Spectroscopic Data X-Ray Transition Energies Database
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