Atomic Symbol: As
Atomic Number: 33
Atomic Weight: 74.9216
Isotopes and Abundances: 75As 100%
1 Atm Melting Point: 1090 K
1 Atm Boiling Point: 887 K (sublimes)
Common Valences: +5, +3, and −3
Ionic Radii: (+V) 46, (+III) 69, and (−III) 222 ppm
Pauling Electronegativity: 2.18
First Ionization Energy: 947.0 kJ/mol
Chondritic (CI) Abundance: 1.86 ppm
Silicate Earth Abundance: 0.05 ppm
Crustal Abundance: 2.1 ppm
Seawater Abundance: 0.0026 ppm
Core Abundance: 5 ppm
Properties
Arsenic (Emsley 1991, 2001; Anthoni 2006; Anders and Grevesse 1989; McDonough 2005), a metalloid, has three allotropic forms: yellow, black, and gray. The most common form is a shiny, gray, brittle, metallic-looking crystalline solid. The less common yellow form is a crystalline solid which is produced when vapors of arsenic are cooled suddenly. It tarnishes rapidly in air and when heated does not melt, but sublimes although it can be forced to melt as well. When arsenic is heated in air, it...
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References
Anders E, Grevesse N (1989) Abundances of the elements: meteoritic and solar. Geochim Cosmochim Acta 53:197–214. http://meteorites.wustl.edu/goodstuff/chondritic_abundances.htm
Anthoni JF (2006) The chemical composition of seawater in. http://www.seafriends.org.nz/oceano/seawater.htm
Emsley J (1991) The elements, 2nd edn. Clarendon Press, Oxford
Emsley J (2001) Nature’s building blocks an A-Z guide to the elements. Oxford University Press, Oxford
McDonough WF (2005) Compositional model for the earth’s core. In: Carlson RW (ed) The mantle and core. Elsevier, Oxford, pp 547–568. http://www.knowledgedoor.com/2/elements_handbook/element_abundances_in_the_earth_s_core.html
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Vasiliu, M., Dixon, D.A. (2018). Arsenic. 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_26
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