Calcium: Physical Properties --silver-grey metal. melts at 840°C, boils at 1484°C to produce monatomic gas. density 1540 kg/m^3. Conductor of electricity but a poor one com … pared to most other metals.Diamagnetic. Chemical properties -- tarnishes rapidly in air to produce a powdery, flaky oxide coating.Reacts steadily with water, giving off bubbles of hydrogen and a solution/slurry of alkaline, sparingly soluble calcium hydroxide. Flammable at high temperatures with oxygen, or air.an also burn in nitrogen to form calcium nitride or carbon dioxide to form calcium carbonate. Nearly all compounds are in oxidation state +2, and the water chemistry of calcium is dominated by the hydrated Ca(2+) ion.