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Calcium is dull gray, but it is shiny when scratched. Other physical properties. Calcium is an excellent conductor of electricity. It is very soft and easily scratched. Chemical properties. Calcium reacts rapidly with air to form a coating of gray oxide, and it burns with a red flame.
Properties of calcium. Calcium as a metal has a silvery color and is rather hard. It is one of the alkaline earth elements. It readily forms a white coating of nitride in air, reacts with water and burns with a yellow-red flame. Calcium has a large number of both natural and manufactured compounds that are widely used.