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Nickel, a silver-white, hard, ductile, ferromagnetic metallic element that is highly polished and resistant to corrosion. Nickel is an iron-loving element. The highest nickel content in the earth's core is a natural nickel-iron alloy. In the crust, the nickel content of ferromagnesia rocks is higher than that of silica-aluminum rocks. For example, the nickel content of peridotite is 1000 times that of granite, and the nickel content of gabbro is 80 times that of granite.

Nickel is a silver-white metal with magnetic properties and good plasticity. Nickel is a silvery-white, hard, ductile, ferromagnetic metallic element that is highly polished and resistant to corrosion. Dissolved in nitric acid, it appears green. Used chiefly in alloys (e.g., nickel steel and nickel silver) and as catalysts (e.g., Laney nickel, especially as a catalyst for hydrogenation).

Nickel is insoluble in water and forms a dense oxide film on the surface in humid air at room temperature, which can prevent the bulk metal from continuing to oxidize. It can dissolve slowly in dilute acid and release hydrogen gas to produce the green plus divalent nickel ion Ni2+. Strong alkali resistance. Nickel can be burned in pure oxygen, producing a brilliant white glow. Nickel also burns in chlorine and fluorine. The oxidizing solution, including nitric acid, does not react. Nickel is a moderate-strength reducing agent. Nickel is slowly corroded by hydrochloric acid, sulfuric acid, organic acid and alkaline solution. Nickel dissolves slowly in dilute nitric acid. Fuming nitric acid can passivate nickel surface and has corrosion resistance. Nickel, like platinum and palladium, can absorb a large amount of hydrogen during passivation. The smaller the particle size, the greater the absorption amount. The important salts of nickel are nickel sulfate and nickel chloride. Nickel nitrate is also commonly used in the laboratory, with crystalline 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 stable to water and air at room temperature and can resist alkaline corrosion, so nickel can be used in the laboratory