Gerhold chemetals Submitted 2018-12-21 08:21:47 Chromium Mario Lemieux Jersey Authentic , chemical symbol Cr, elemental steel gray metal. The name of the element comes from the Greek word, which means 鈥渃olor鈥?because the compounds of chrome have colors. In 1797, the French chemist uelin discovered a new mineral in the Siberian red lead (chromium ore), which was obtained by carbon reduction the following year. The content of chromium in the earth's crust is 0.01% Sidney Crosby Jersey Authentic , ranking 17th. There is no free state of chromium in nature, mainly in chromite [1]. In the periodic table of the VIB family, the atomic number of chromium is 24, the atomic weight is 51.9961, and the body-centered cubic crystals have common valences of +2 Jake Guentzel Jersey Authentic , +3, and +6. The oxidation number is 6, 5, 4, 3 Matt Murray Jersey Authentic , 2, 1, 鈭?, 鈭?, 鈭? [2] Patric Hornqvist Jersey , which is the hardest metal.
Product name: Chromium(III) atomic absorption standard solution Alias: chromium coating quality balzers 0.7-3.5 mm, etc. CAS: 7440-47-3 EINECS: 231-157-5 Element symbol: Cr Element atomic weight: 51.9961 Element type: metal element Atomic volume: (cubic centimeters mole) 7.23 The content of elements in the sun: (ppm) 20 Content of elements in seawater: (ppm) Pacific surface 0.00015 Content in the earth's crust: (ppm) 100 Number of protons: 24
Crystal structure: The unit cell is a body-centered cubic unit cell, and each unit cell contains two metal atoms. Oxidation state: MainCr+3 OtherCr-2, Cr-1, Cr0 Evgeni Malkin Jersey , Cr+1, Cr+2, Cr+4, Cr+5, Cr+6 Electronegativity: 1.66 Peripheral electronic layout: 3d5 4s1 extra-core electronic layout: 2#6,8#13,1 Isotope and radiation: Cr-49[42.3m] Cr-50 Cr-51[27.7d] *Cr-52 Cr-53 Cr-54
Electron affinity and energy: 0 KJ路mol-1 First ionization energy: 653 KJ路mol-1 Second ionization energy: 1592 KJ路mol-1 Third ionization energy: 2987 KJ路mol-1 Solid density: 7.19 gcm3 Liquid density: 6.9gcm3 Specific heat: 448Jkg.K (300K). Thermal conductivity: 90.7Wm.K (300K). Elemental melting point: 1857.0 掳C Elemental boiling point: 2672.0 掳C Atomic radius: 1.85 angstroms Radius: 0.62 (+3) angstroms Covalent radius: 1.18 angstroms
Cell parameters: a = 291 pm b = 291 pm c = 291 pm 伪 = 90掳 尾 = 90掳 纬 = 90掳 Mohs hardness: 9
Ionization energy (kJ mol) M - M+ 652.7 M+ - M2+ 1592 M2+ - M3+ 2987 M3+ - M4+ 4740 M4+ - M5+ 6690 M5+ - M6+ 8738 M6+ - M7+ 15550 M7+ - M8+ 17830 M8+ - M9+ 20220 M9+ - M10+ 23580 Winning Marketing Ideas for Food Companies Marketing Articles | February 18, 2016 Several foods companies are coming up in market to meet rising demands of edible items. But, food companies are facing serious challenge of improving sale of products. Most of the sales are enjoyed by...
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