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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.
Calcium: orbital properties Read more Â». Calcium atoms have 20 electrons and the shell structure is 2.8.8.2. The ground state electronic configuration of neutral Calcium is [Ar].4s2 and the term symbol of Calcium is 1S0.