Atomic Symbol: Cs
Atomic Number: 55
Atomic Weight: 132.90545 u
Isotopes and Abundances: 133Cs, ~100%
1 Atm Melting Point: 28.5 °C
1 Atm Boiling Point: 670.8 °C
Common Valences: 1+
Ionic Radii: 12-fold: 188 pm
Pauling Electronegativity: 0.79
First Ionization Energy: 375.4 kJ/mol
Chondritic (CI) Abundance: 0.188 ppm
Silicate Earth Abundance: 7.7 ppb
Crustal Abundance: 2 ppm
Seawater Abundance: 2 nmol/kg
Core Abundance: ~0
Properties
Caesium, a reactive silvery-gold metal belonging to the group IA on the periodic table, is one of the alkali elements and considered as a “lithophile” element as defined by Goldschmidt. Caesium, atomic number 55, has a standard atomic weight of 132.90545 and an electronic configuration of [Xe]6 s1. The lone 6 s electron is relatively easily removed; this first ionization potential of Cs is 375.4 kJ/mol. Caesium is highly ionic in character and the ionic radius of Cs1+is 188 pm in 12-fold coordination. Caesium has a 1 atm melting...
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Bebout, G.E. (2018). Caesium. In: White, W.M. (eds) Encyclopedia of Geochemistry. Encyclopedia of Earth Sciences Series. Springer, Cham. https://doi.org/10.1007/978-3-319-39312-4_221
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