Vanadium

23

V

50.9415(1)

  • Name: Vanadium
  • Symbol: V
  • Atomic number: 23
  • Atomic weight: 50.9415(1)
  • CAS Registry ID: 7440-62-2
  • Group name: (none)
  • Period number: 4
  • Block: d-block
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Description

Vanadium is a transition metal that has a silver grey metal color in its natural solid state. It is a soft metal that oxidizes when heated. Vanadium has an atomic weight of 50.9415, a melting point of 3470 °F, and a boiling point of 6165 °F. Some common uses of vanadium include: as ferrovanadium which is a steel additive, as a metallic alloy in the use of surgical tools and rust resistant steels, as a catalyst in the manufacture of sulfuric acid.

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Isolation

Vanadium does not occur freely in nature, but is found in a variety of minerals. Different processes can be used to isolate vanadium from these minerals.

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Large scale industrial isolation of vanadium for commercial uses does not have to be constructed solely for the purpose of vanadium isolation; most vanadium that is isolated is formed as a byproduct from other industrial chemical processes.

Vanadium ore, or residues gathered as a byproduct, are heated to approximately 1562 °F and reacted with sodium chloride or sodium carbonate; the result of this reaction is sodium vanadate. From this product, vanadium pentoxide is formed by dissolving and acidifying sodium vanadate in water and then heating the solution. Vanadium pentoxide is then reduced through a reaction with calcium to yield pure vanadium.

Another isolation process that can be used to form pure vanadium on a very small scale involves reducing vanadium pentachloride by reacting it with hydrogen or magnesium.

Pure vanadium is not normally produced on a very large scale as ferrovanadium; the main form of ferrovanadium that is used can be produced by reacting vanadium pentoxide with crude iron.


General
Name Vanadium
Symbol V
Number 23
Chemical series transition metals
Group 5
Period 4
Block d
Appearance silver-grey metal
Standard atomic weight 50.9415(1) g·mol−1
Electron configuration [Ar] 3d3 4s2
Electrons per shell 2, 8, 11, 2
Atomic properties
Crystal structure cubic body centered
Oxidation states 2, 3, 4, 5 (amphoteric oxide)
Electronegativity 1.63 (Pauling scale)
Ionization energies 1st: 650.9 kJ·mol−1
(more) 2nd: 1414 kJ·mol−1
(more) 3rd: 2830 kJ·mol−1
Atomic radius 135 pm
Atomic radius (calc.) 171 pm
Covalent radius 125 pm
Van der Waals radius
Physical properties
Phase solid
Density (near r.t.) 6.0 g·cm−3
Liquid density at m.p. 5.5 g·cm−3
Melting point 2183 K (1910 °C, 3470 °F)
Boiling point 3680 K (3407 °C, 6165 °F)
Critical point
Heat of fusion 21.5 kJ·mol−1
Heat of vaporization 459 kJ·mol−1
Heat capacity (25 °C) 24.89 J·mol−1·K−1
Miscellaneous
Magnetic ordering paramagnetic
Electrical resistivity (20 °C) 197 nΩ·m
Thermal conductivity (300 K) 30.7 W·m−1·K−1
Thermal expansion (25 °C) 8.4 µm·m−1·K−1
Speed of sound (thin rod) (20 °C) 4560 m/s
Young's modulus 128 GPa
Shear modulus 47 GPa
Bulk modulus 160 GPa
Poisson ratio 0.37
Mohs hardness 6.7
Vickers hardness
Brinell hardness
CAS registry number 7440-62-2

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