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History and Uses: Although calcium is the fifth most abundant element in the earth's crust, it is never found free in nature since it easily forms compounds by reacting with oxygen and water. Metallic calcium was first isolated by Sir Humphry Davy in 1808 through the electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO).
Yes, because the masses are almost the same. No, because calcium had not been discovered in Dalton's time. No, because all calcium atoms have a mass of 40 u. No, because Dalton's theory said that all atoms of a given element were alike in mass. Yes, because these represent two isotopes of calcium.