Complaint
Description of Product
Product Features:
1, metal chromium 99-A: can do particle size range: block, granular, powder: 40 mesh -500 mesh
Scope of application: a, smelting, welding, powder metallurgy, carbide additives, glass colorant, stainless steel additives, etc
b, chromium and chromium can make steel, copper, aluminum and other metals form corrosion resistant surface, is a new type of surface treatment agent.
C, cr powder is widely used in stainless steel, vacuum coating, ceramic, etc
Product shape: Irregular
Product material:
Product Name: Chrome metal powder
Grade /Spec: JCr-99A
Chemical composition: Chemical composition:
Granularity /SIZE: 40-300 mesh
Cr
99.17%
Cu
Chromium, the chemical symbol Cr, has an atomic number of 24 and belongs to group B in the periodic table. The name comes from the Greek word for "color," because chromium compounds have color. It is a steel-gray metal, which is the hardest metal in nature. Chromium is the 17th most abundant in the Earth's crust at 0.01%. The free form of natural chromium is extremely rare and mainly exists in chromium-lead ore.
On October 27, 2017, the International Agency for Research on Cancer (IARC) of the World Health Organization (WHO) published a preliminary list of carcinogens for reference, chromium metal in the list of three categories of carcinogens
Basic properties of chromium metal
Atomic volume: 7.23cm3/mol
Element content in the Sun: 20ppm
Element content in seawater: 0.00015ppm on the surface of the Pacific Ocean
Content in the crust: 100ppm
Number of protons: 24
Number of neutrons: 28
Atomic number: 24
Owning period: 4
Family number: VIB
Nuclear charge: 24
Electron shell distribution: 2-8-13-1
Electron shell: K-L-M-N
Outer electron layer arrangement: 3d54s1
Crystal structure: The cell is a body centered cubic cell, each cell contains 2 metal atoms.
Oxidation states: +3 (main), +6, +5, +4, +2, + 1,0, -1, -2
Electronegativity: 1.66
Peripheral electron configuration: 3d5 4s1
Electron configuration: 2,8,13,1
Isotopes: Cr-49, Cr-50, Cr-51, Cr-52, Cr-53, Cr-54
First ionization energy: 653KJ·mol-1
Second ionization energy: 1592KJ·mol-1
Third ionization energy: 2987KJ·mol-1
Solid density: 7.19g/cm3
Liquid density: 6.9g/cm3
Specific heat: 448J/(kg·K)(300K)
Thermal conductivity: 90.7W/(m·K)(300K)
Elemental melting point: 1907ºC
Elemental boiling point: 2761ºC
Atomic radius: 1.28 angstroms [1]
Ionic radius: 0.62 angstroms (+3)
Covalent radius: 1.18 angstroms
Cell parameters: a = 291 pm; b = 291 pm; c = 291 pm; α = 90°; β = 90°; Gamma is equal to 90 degrees
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
Physical properties
Metal chrome block, glass seal chrome display specimen
Metal chrome block, glass seal chrome display specimen
Chromium is a silvery shiny metal. Pure chromium is malleable. Impurities are hard and brittle. Density 7.20g/cm3. Soluble in strong alkali solution. Chromium is highly resistant to corrosion and oxidizes very slowly in air, even in a state of red heat. Insoluble in water. Plating on metal provides protection.
