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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.
In order to understand the chemical properties of calcium, you first must understand what chemical properties are. Get a working definition of the difference between physical and chemical properties, and learn what are the chemical properties of calcium and the compounds it can form.