Nickel metal is a erromagnetic meta

Nickel is a hard, ductile and ferromagnetic metal that can be highly polished and resistant to corrosion. Nickel is an iron-philic element. The core is mainly composed of iron and nickel. In the earth's crust, the nickel content of mafic rocks is higher than that of silicoaluminous rocks. For example, the nickel content of peridotite is 1,000 times that of granite, and the nickel content of gabbro is 80 times that of granite.

On October 27, 2017, the list of carcinogens published by the International Agency for Research on Cancer of the World Health Organization was initially compiled for reference. In the list of first-class carcinogens of nickel compounds, metallic cobalt and metallic nickel contain 66-67% nickel and 13-16% The implanted foreign body of chromium and 7% iron alloy powder, nickel metal and nickel alloy are in the list of 2B carcinogens.

Physical properties of nickel:

It has good ductility and medium hardness.

Nickel is a silver-white metal with magnetism and good plasticity. It has good corrosion resistance, nickel is similar to silver white, hard, ductile and ferromagnetic metal element, it can be highly polished and corrosion resistant. After being dissolved in nitric acid, it turns green. Mainly used in alloys (such as nickel steel and nickel silver) and as a catalyst (such as Raney nickel, especially as a hydrogenation catalyst)

The chemical properties of nickel:

The peripheral electronic arrangement 3d84s2 is located in the VIII family of the fourth cycle. The chemical properties are more active, but more stable than iron. It is difficult to oxidize in the air at room temperature and hard to react with concentrated nitric acid. The fine nickel wire is combustible, reacts with halogen when heated, and dissolves slowly in dilute acid. It can absorb a considerable amount of hydrogen.

Nickel is insoluble in water and forms a dense oxide film on the surface in humid air at room temperature, which can prevent the body metal from continuing to oxidize. It can slowly dissolve in dilute acid and release hydrogen to produce green positive divalent nickel ion Ni2+; it is resistant to strong alkalis. Nickel can burn in pure oxygen and emit a dazzling white light. Similarly, nickel can also be burned in chlorine and fluorine gas. It does not react with oxidant solutions including nitric acid. Nickel is a medium-strength reducing agent. Nickel hydrochloric acid, sulfuric acid, organic acids and alkaline solutions are very slow to etch nickel. Nickel slowly dissolves in dilute nitric acid. Fuming nitric acid can passivate the surface of nickel and have corrosion resistance. Like platinum and palladium, nickel can absorb a large amount of hydrogen during passivation. The smaller the particle size, the greater the absorption. The important salts of nickel are nickel sulfate and nickel chloride. Nickel nitrate is also commonly used in the laboratory, with crystal water, the chemical formula is Ni(NO3)2·6H2O, green transparent particles, easy to absorb water vapor in the air. Similar to iron and cobalt, it is relatively stable to water and air at room temperature, and can resist alkaline corrosion. Therefore, a nickel crucible can be used to melt alkali in the laboratory. Nickel sulfate (NiSO4) can form alum Ni(SO4)₂·6H2O with alkali metal sulfate (MI is an alkali metal ion). +2 valence nickel ions can form coordination compounds. Under normal pressure, nickel can react with carbon monoxide to form highly toxic nickel tetracarbonyl (Ni(CO)4), which will decompose into metallic nickel and carbon monoxide after heating.