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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.
One of the chemical properties of calcium is that it reacts with a lot of other substances. As a result, pure calcium is never found in nature; it reacts too easily with other elements and with water. Calcium belongs to the alkaline-earth metal elements on the periodic table, which all react with water.