Encyclopedia of Geochemistry

2018 Edition
| Editors: William M. White

Barium

  • William M. WhiteEmail author
Reference work entry
DOI: https://doi.org/10.1007/978-3-319-39312-4_79

Element Data

Atomic Symbol: Ba

Atomic Number: 56

Atomic Weight: 132.9054 g/mol

Isotopes and Abundances: 130Ba 0.11%, 132Ba 0.10%, 134Ba 2.42%, 135Ba 6.59%, 136Ba 7.85%, 137Ba 11.23%, 138Ba 71.70%

1 Atm Melting Point: 727 °C

1 Atm Boiling Point: 1845 °C

Common Valences: 2+

Ionic Radii: 149 pm (6-fold)

Pauling Electronegativity: 0.89

First Ionization Energy: 502.9 kJ/mol

Chondritic (CI) Abundance: 2.42 ppm

Silicate Earth Abundance: 6.6 ppm

Crustal Abundance: 390 ppm

Seawater Abundance: 30 to 150 nmol/kg

Core Abundance: ~0

Properties

Barium derived its English name from the Greek barys, meaning heavy. It is the heaviest stable alkaline earth and unusually abundant for an element with such a high atomic number. Barium, Pb, and Te are the only elements heavier than Zr (atomic number 40) with CI chondritic abundances greater than 2 ppm (Palme (in press),  “Cosmic Elemental Abundances,” this volume). This is due in large part to the unusual abundance of 138Ba, which has a magic number of...

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References

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Copyright information

© Springer International Publishing AG, part of Springer Nature 2018

Authors and Affiliations

  1. 1.Department of Earth and Atmospheric SciencesCornell UniversityIthacaUSA