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Calcium is classified chemically as one of the alkaline earth elements (that is, in Group 2 of the periodic table. The metal is rather reactive. It readily forms a white coating of calcium nitride (Ca 3 N 2) in air.
In the case of Cl, there are 7 valence electrons because the highest energy level, 3, has 7 total electrons. For Ca, there are two valence electrons. For Br, the highest level is 4, and there are 7 electrons, so the number of valence electrons for Br is 7.