Difference between revisions of "Chromium"

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(Added link to page detailing lunar chromite deposits)
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name=Chromium                                                                                                                                                                                                                        |
 
name=Chromium                                                                                                                                                                                                                        |
 
symbol=Cr                                                                                                                                                                                                                            |
 
symbol=Cr                                                                                                                                                                                                                            |
available=                                                                                                                                                                                                                           |
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available=abundant                                                                                                                                                                                                                          |
 
need=                                                                                                                                                                                                                                |
 
need=                                                                                                                                                                                                                                |
 
number=24                                                                                                                                                                                                                            |
 
number=24                                                                                                                                                                                                                            |
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"Chromium use in iron, steel, and nonferrous alloys enhances hardenability and resistance to corrosion and oxidation. The use of chromium to produce stainless steel and nonferrous alloys are two of its more important applications.  Other applications are in alloy steel, plating of metals, pigments, leather processing, catalysts, surface treatments, and refractories." - USGS Chromium Statistics and Information[http://minerals.usgs.gov/minerals/pubs/commodity/chromium/]
 
"Chromium use in iron, steel, and nonferrous alloys enhances hardenability and resistance to corrosion and oxidation. The use of chromium to produce stainless steel and nonferrous alloys are two of its more important applications.  Other applications are in alloy steel, plating of metals, pigments, leather processing, catalysts, surface treatments, and refractories." - USGS Chromium Statistics and Information[http://minerals.usgs.gov/minerals/pubs/commodity/chromium/]
 
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The most important and abundant ore of chromium is [[chromite]].
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The most important and abundant ore of chromium is [[chromite]]. Geologic surveys of the moon have located large deposits of chromite on the Sinus Aestuum, covering an area thousands of square kilometers in size[http://www.nasa.gov/topics/moonmars/features/moonrock-king_prt.htm].
 
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Revision as of 21:21, 6 August 2011

Chromium
Cr
In situ availability: abundant
Necessity:
Atomic number: 24
Atomic mass: 51.9961
group: 6
period: 4
normal phase: Solid
series: Transition Metals
density: 7.15 g/cm3
melting point: 2180K,
1907°C,
3465°F
boiling point: 2944K,
2671°C,
4840°F
N/AN/AN/A
V ← Cr → Mn
NbMoTc
Atomic radius (pm): 140
Bohr radius (pm): 166
Covalent radius (pm): 127
Van der Waals radius (pm):
ionic radius (pm): (+3) 62
1st ion potential (eV): 6.77
Electron Configuration
1s2
2s2 2p6
3s2 3p6 3d5
4s1
Electrons Per Shell
2, 8, 13, 1
Electronegativity: 1.66
Electron Affinity: 0.67
Oxidation states: 6, 3, 2
Magnetism: Antiferromagnetic
w/Spin Density Wave
Crystal structure: Body centered cubic

Chromium is a Transition Metal in group 6. It has a Body centered cubic crystalline structure. This element has 4 stable isotopes: 50, 52, 53, and 54.

"Chromium use in iron, steel, and nonferrous alloys enhances hardenability and resistance to corrosion and oxidation. The use of chromium to produce stainless steel and nonferrous alloys are two of its more important applications. Other applications are in alloy steel, plating of metals, pigments, leather processing, catalysts, surface treatments, and refractories." - USGS Chromium Statistics and Information[1]

The most important and abundant ore of chromium is chromite. Geologic surveys of the moon have located large deposits of chromite on the Sinus Aestuum, covering an area thousands of square kilometers in size[2].



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