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  Occurrence and principles of extraction of chromium

Occurrence and principles of extraction of chromium:

Atomic mass: 51.99        Valency: 0,1,2,3,4,5,6
Atomic number: 24          Symbol: Cr

Position in the periodic table: Period Number -4, Group Number -6.

L.N. Vanquelin, a French chemist introduced a new element in 1797, while observing a mineral found in Siberia. It was termed as chromium since it forms colored compounds [Greek word - chroma - color]

Occurrence:

Metallic chromium does not take place in the native state.

Ores:

The significant ore of chromium is chrome ore or Chromite, FeOCr2O3
The main ore of chromium is chromite ore.

Alloys of chromium:

294_alloys of chromium.jpg

 

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