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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: properties of free atoms. Calcium atoms have 20 electrons and the shell structure is 2.8.8.2. The ground state electron configuration of ground state gaseous neutral calcium is [ Ar ]. 4s 2 and the term symbol is 1 S 0. am grateful to Gwyn Williams (Jefferson Laboratory, Virginia, USA) who provided the electron binding energy data. The data are adapted from references 1-3. They are tabulated elsewhere on the WWW (reference 4) and in paper form (reference 5).