The specific melting point of nickel is 1453°C.

Other physical properties of nickel:

1. It has good ductility and medium hardness.

2. Nickel is a silver-white metal with magnetism and good plasticity. It has good corrosion resistance. Nickel is a silver-white, hard, ductile and ferromagnetic metal element.

3. It can be highly polished and resistant to corrosion. After being dissolved in nitric acid, it turns green.

4. The density is 8.902 grams per cubic centimeter.

5. The melting point is 1453 degrees Celsius and the boiling point is 2732 degrees Celsius.

Chemical properties of nickel

The peripheral electron configuration is 3d84s2, located in Group VIII of the fourth cycle. Chemically more active, but more stable than iron. It is difficult to oxidize in air at room temperature and does not react easily with concentrated nitric acid. Thin nickel wire is flammable, reacts with halogens when heated, and slowly dissolves in dilute acid. Can absorb a considerable amount of hydrogen.

Nickel is insoluble in water and forms a dense oxide film on its surface in humid air at room temperature, which can prevent the metal from continuing to oxidize. It can be slowly dissolved in dilute acid, releasing hydrogen to produce green positive divalent nickel ions Ni2+; resistant to strong alkali. Nickel can burn in pure oxygen and emit dazzling white light. Likewise, nickel can burn in chlorine and fluorine gases.

Does not react with oxidant solutions including nitric acid. Nickel is a moderately strong reducing agent. Nickel hydrochloric acid, sulfuric acid, organic acids and alkaline solutions etch nickel very slowly. Nickel dissolves slowly in dilute nitric acid. Fuming nitric acid can passivate the nickel surface and make it corrosion resistant. 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 laboratories. It contains crystal water and has a chemical formula of Ni(NO3)2·6H2O. It is a green and transparent particle that can easily 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. Therefore, nickel crucibles can be used to melt alkali in the laboratory.

Nickel sulfate (NiSO4) can form alum Ni(SO4)·6H2O (MI is alkali metal ion) with alkali metal sulfate. +2-valent 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.

Reference for the following content: Baidu Encyclopedia-Nickel