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Metal > ChromiumCr - Chromium This transition metal was discovered by Vanquelin in 1790. Modern uses include pigment, high strength alloys and metal finishing applications. We use chromium compounds for crystal growing, redox titrations and spectrophotometric analysis. Atomic number - 24 Density g/mL 7 .19 Atomic weight u 51 .996 Melting point K 2130 Bonding radius A 1 .18 Boiling point K 2945 Atomic radius A 1 .85 Heat of vaporization kJ/mol 344 .3 Ionization Potential V 6 .766 Heat of fusion kJ/mol 16 .9 Electronegativity - 1 .66 Specific heat J/gK 0 .45 The oxide is a strong acid. Crystal are body centered cubic. Electron config. : [Ar] 3d5 4s1 Definition: When used as an alloying element, chromium increases the hardenability of steel and in association with high carbon gives resistance to wear and abrasion. Chromium has an important effect on corrosion resistance and is present in stainless steels in amounts of 12% to 20%. It is also used in heat-resisting steels and high duty cast irons.
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