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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.
The chemical properties of calcium are reacts with oxygen and reacts with water. There are other chemical properties, but not all of them are true for calcium.These are the two that I know.he chemical properties of calcium are reacts with oxygen and reacts with water. There are other chemical properties, but not all of them are true for calcium.