Nickel, element symbol is Ni, atomic number 28 in the periodic table of elements, relative atomic mass 58.69, is a group VIII metal. The density is 8.9g/cm_and the melting point is 1455 C. The boiling point is 2730. Nickel is a kind of silver-white metal. It is easy to be oxidized by air. Some black oxide films are formed on the surface of nickel. Therefore, which is often black in color. Nickel is hard, has good ductility, magnetism and corrosion resistance, and can be highly polished. it is also abundant in the crust. It exists in nature in the form of nickel silicate ore or sulfur, arsenic and nickel compounds. it is often used in the manufacture of stainless steel, alloy structural steel and other steel fields, electroplating, high nickel-based alloys and batteries and other fields, widely used in aircraft, radar and other military manufacturing, civil machinery manufacturing and electroplating industry.

  Physical properties of nickel

  Nickel is a silver-white metal with good mechanical strength and ductility. It is insoluble in water and has strong corrosion resistance to acid and alkali, but it is easy to dissolve in dilute nitric acid and aqua regia. High temperature resistance, melting point 1455 C, boiling point 2730 C. The density is 8.902 g/cm_.

 Chemical Properties of Nickel

 At room temperature, nickel forms a dense oxide film on the surface of nickel in moist air, which turns dark and prevents the bulk metal from further oxidation. Organic acid, hydrochloric acid, sulfuric acid and alkaline solution etch it very slowly. Nickel dissolves slowly in dilute nitric acid. The fuming nitric acid can passivate the surface and has corrosion resistance. Like platinum and palladium, it can absorb a lot of hydrogen when passivated. The smaller the particle size, the larger the absorption. The important salts are nickel sulfate and chloride. Similar to iron and cobalt, it is stable to water and air at room temperature and can resist alkaline corrosion. Therefore, Nickel Crucible can be used to melt alkaline substances in laboratory. it is soluble in dilute acid. Unlike iron, cobalt and nickel react strongly with concentrated nitric acid and slowly with dilute nitric acid.

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