Chemical formula: Ni, Shape: silvery white powder, CAS no. : 7440-02-0 Density: 8.9g/cm 3, Melting point: 1455℃, Boiling point: 2730℃, Loose density: 2.5-3.5g/cm3 Liquidity: 15-25S /50g Ionization energy: 7.635 electron volts.Solid, magnetic and good plasticity. Have good corrosion resistance, in the air is not oxidized, and strong alkali resistance. It dissolves slowly in dilute acid and releases gas to produce green positive divalent nickel ion Ni2+. The oxidation solution,including nitric acid, does not react. Nickel is a medium strength reducing agent.