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Symbolic elements Zn, atomic number 30, atomic weight 65.38, the external electronic 3d104s2 arrangement at the fourth cycle II B - . 125 picometer atomic radius, the first ionization energy 915kJ/mol, electricity negative 1.6. Several major +2 oxidation. A slightly blue silvery white metallic sheen and hardness 2.5, extensible, good heat transfer, conductivity, density 7.14g/cm3, 419.58 ° C melting point, boiling point of 907 ° C. Chemical properties lively. At room temperature in air more stable. The humid air layer of gray generate basic zinc carbonate and can be used for protection film. Zinc combustion flame is blue and green. Temperatures reaction with water vapor release of hydrogen. When heating with halogen, sulfur reaction. Easy with acid reaction, but the slow response of high purity zinc, and the inclusion of a small amount of copper sulfate solution, or with copper, nickel, platinum and other metal contacts, the reaction speed up. Soluble alkali solution, generating zincate, such as :
Zn +2 = Na2ZnO2 NaOH + H2 �
soluble ammonia and ammonium salt solutions, such as :
Zn +2 NH4< / SUB>Cl = Zn (NH3) 2Cl2 + H2
& �nbsp; the main system for the alloy, galvanized metal surface, the system is also used in batteries, fireworks, and the catalyst reductant. China's Ming Dynasty had previously found and the use of zinc. Major minerals are sphalerite ZnS, smithsonite ZnCO3 so. First calcined ore into zinc oxide, and then zinc oxide reduction of coke obtained.
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