Vanadium

Vanadium, ₂₃V

Vanadium
Pronunciation	/vəˈneɪdiəm/ ​(və-NAY-dee-əm)
Appearance	blue-silver-grey metal
Standard atomic weight Ar°(V)
	50.9415±0.0001[1] 50.942±0.001 (abridged)[2]
Vanadium in the periodic table
Hydrogen Helium Lithium Beryllium Boron Carbon Nitrogen Oxygen Fluorine Neon Sodium Magnesium Aluminium Silicon Phosphorus Sulfur Chlorine Argon Potassium Calcium Scandium Titanium Vanadium Chromium Manganese Iron Cobalt Nickel Copper Zinc Gallium Germanium Arsenic Selenium Bromine Krypton Rubidium Strontium Yttrium Zirconium Niobium Molybdenum Technetium Ruthenium Rhodium Palladium Silver Cadmium Indium Tin Antimony Tellurium Iodine Xenon Caesium Barium Lanthanum Cerium Praseodymium Neodymium Promethium Samarium Europium Gadolinium Terbium Dysprosium Holmium Erbium Thulium Ytterbium Lutetium Hafnium Tantalum Tungsten Rhenium Osmium Iridium Platinum Gold Mercury (element) Thallium Lead Bismuth Polonium Astatine Radon Francium Radium Actinium Thorium Protactinium Uranium Neptunium Plutonium Americium Curium Berkelium Californium Einsteinium Fermium Mendelevium Nobelium Lawrencium Rutherfordium Dubnium Seaborgium Bohrium Hassium Meitnerium Darmstadtium Roentgenium Copernicium Nihonium Flerovium Moscovium Livermorium Tennessine Oganesson – ↑ V ↓ Nb titanium ← vanadium → chromium
Atomic number (Z)	23
Group	group 5
Period	period 4
Block	d-block
Electron configuration	[Ar] 3d3 4s2
Electrons per shell	2, 8, 11, 2
Physical properties
Phase at STP	solid
Melting point	2183 K ​(1910 °C, ​3470 °F)
Boiling point	3680 K ​(3407 °C, ​6165 °F)
Density (near r.t.)	6.11 g/cm3
when liquid (at m.p.)	5.5 g/cm3
Heat of fusion	21.5 kJ/mol
Heat of vaporization	444 kJ/mol
Molar heat capacity	24.89 J/(mol·K)
Vapor pressure P (Pa) 1 10 100 1 k 10 k 100 k at T (K) 2101 2289 2523 2814 3187 3679
Atomic properties
Oxidation states	−3, −1, 0, +1, +2, +3, +4, +5 (an amphoteric oxide)
Electronegativity	Pauling scale: 1.63
Ionization energies	1st: 650.9 kJ/mol 2nd: 1414 kJ/mol 3rd: 2830 kJ/mol (more)
Atomic radius	empirical: 134 pm
Covalent radius	153±8 pm
Spectral lines of vanadium
Other properties
Natural occurrence	primordial
Crystal structure	​body-centered cubic (bcc) (cI2)
Lattice constant	a = 302.72 pm (at 20 °C)[3]
Thermal expansion	8.4 µm/(m⋅K) (at 25 °C)
Thermal conductivity	30.7 W/(m⋅K)
Electrical resistivity	197 nΩ⋅m (at 20 °C)
Magnetic ordering	paramagnetic
Molar magnetic susceptibility	+255.0×10−6 cm3/mol (298 K)[4]
Young's modulus	128 GPa
Shear modulus	47 GPa
Bulk modulus	160 GPa
Speed of sound thin rod	4560 m/s (at 20 °C)
Poisson ratio	0.37
Mohs hardness	6.7
Vickers hardness	628–640 MPa
Brinell hardness	600–742 MPa
CAS Number	7440-62-2
History
Discovery	Andrés Manuel del Río[5] (1801)
First isolation	Henry Enfield Roscoe (1867)
Named by	Nils Gabriel Sefström (1830)
Isotopes of vanadium v e
Main isotopes Decay abun­dance half-life (t1/2) mode pro­duct 48V synth 16 d β+ 48Ti 49V synth 330 d ε 49Ti 50V 0.25% 2.71×1017 y β+ 50Ti 51V 99.8% stable
Category: Vanadium view talk edit | references

Vanadium is a chemical element; it has symbol V and atomic number 23. It is a hard, silvery-grey, malleable transition metal. The elemental metal is rarely found in nature, but once isolated artificially, the formation of an oxide layer (passivation) somewhat stabilizes the free metal against further oxidation.

Spanish-Mexican scientist Andrés Manuel del Río discovered compounds of vanadium in 1801 by analyzing a new lead-bearing mineral he called "brown lead". Though he initially presumed its qualities were due to the presence of a new element, he was later erroneously convinced by French chemist Hippolyte Victor Collet-Descotils that the element was just chromium. Then in 1830, Nils Gabriel Sefström generated chlorides of vanadium, thus proving there was a new element, and named it "vanadium" after the Scandinavian goddess of beauty and fertility, Vanadís (Freyja). The name was based on the wide range of colors found in vanadium compounds. Del Rio's lead mineral was ultimately named vanadinite for its vanadium content. In 1867, Henry Enfield Roscoe obtained the pure element.

Vanadium occurs naturally in about 65 minerals and fossil fuel deposits. It is produced in China and Russia from steel smelter slag. Other countries produce it either from magnetite directly, flue dust of heavy oil, or as a byproduct of uranium mining. It is mainly used to produce specialty steel alloys such as high-speed tool steels, and some aluminium alloys. The most important industrial vanadium compound, vanadium pentoxide, is used as a catalyst for the production of sulfuric acid. The vanadium redox battery for energy storage may be an important application in the future.

Large amounts of vanadium ions are found in a few organisms, possibly as a toxin. The oxide and some other salts of vanadium have moderate toxicity. Particularly in the ocean, vanadium is used by some life forms as an active center of enzymes, such as the vanadium bromoperoxidase of some ocean algae.