Iron magnetic and ductility can be electrical and thermal conductivity. At room temperature, the nickel in the moist air in the dense oxide film formed on the surface, not only continue to be able to prevent oxidation, but also alkali, salt solution corrosion. Massive nickel not burn, thin nickel wire flammable, a special small porous nickel particles in the air will be spontaneous. When heated, nickel and oxygen, sulfur, chlorine, bromine violent reaction. Fine powder of metal nickel during heating may absorb a considerable amount of hydrogen gas. Nickel can be slowly dissolved in dilute hydrochloric acid, sulfuric acid, dilute nitric acid, fuming nitric acid in the surface passivation. Of nickel oxidation state of -1, +1, +2, +3, +4, simply compounds the most stable prices in order to +2, +3 price of nickel salt as the oxidant. Nickel oxides are NiO and Ni2O3. 〔Nickel hydroxide Ni (OH) 2〕 as alkali, slightly soluble in water, soluble in acid. Nickel sulfate (NiSO4) with the formation of alkali metal sulfate alum Ni (SO4) 2o6H2O (MI for the alkali metal ions). +2 Price of nickel ions can form coordination compounds. The pressure, the nickel and carbon monoxide can form four 〔nickel carbonyl Ni (CO) 4〕, heated it will decompose into metallic nickel and carbon monoxide.
Silver-white metal, density of 8.9 grams / cm 3. Melting point 1455 ℃, boiling point 2730 ℃. Valence 2 and 3. Ionization energy of 7.635 electron volts. Quality hard, with magnetic and good plasticity. Have a good corrosion resistance, are not oxidized in the air, but also resistant to alkali. Can be slowly dissolved in acid, releasing hydrogen is generated green bivalent nickel ions Ni2 +; right-oxidants, including nitric acid solution, included, not react. Nickel is a moderate reducing agent.
Silver-white metal, density of 8.9 grams / cm 3. Melting point 1455 ℃, boiling point 2730 ℃. Valence 2 and 3. Ionization energy of 7.635 electron volts. Quality hard, with magnetic and good plasticity. Have a good corrosion resistance, are not oxidized in the air, but also resistant to alkali. Can be slowly dissolved in acid, releasing hydrogen is generated green bivalent nickel ions Ni2 +; right-oxidants, including nitric acid solution, included, not react. Nickel is a moderate reducing agent.
