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Vanadium

Abstract : Vanadium (chemical symbol, V) is a d-block transition metal,silver in color, appearing in the first long period of the peri-odic table between titanium and chromium. Vanadium hastwo stable isotopes: 50V and 51V, with atomic abundance of0.25 % and 99.75 %, respectively. Vanadium has several oxidation forms (between 2+ and 5+). In the lithosphere, Voccurs as reducing V(III) form, whereas in oxidizing con- ditions V prevails under V(IV) form. Vanadium(II) is partic- ularly unstable in the environment. Vanadium(III) is more stable than V(II), but it is also gradually oxidized by the air or dissolved oxygen. Vanadium(V) is expected to be the prevailing form in waters exposed to atmospheric oxygen, whereas V(IV) may be present in reducing environments. Depending upon geometry and environment, V ionic radii vary between 36 pm and 79 pm. Vanadium has a high melting point of 1910 42 C and is a mildly incompatible, refractory,lithophile (siderophile in the iron core and chondrites) ele- ment. Vanadium has an electronegativity of 1.63 on the Pau- ling scale and displays a first ionization potential of 6.74 eV. More details can be found in Richards (2006) and Haynes (2015).
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Submitted on : Monday, July 18, 2016 - 11:17:07 AM
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Olivier Pourret, Aline Dia. Vanadium. Bill White; William Casey; Steve Goldstein; Hiliary Harnett; Bernard Marty; Hisayoshi Yurimoto. Encyclopedia of Geochemistry, Springer, pp.1474-1476, 2018, 978-3-319-39311-7. ⟨10.1007/978-3-319-39312-4_272⟩. ⟨insu-01346032⟩

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