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  1. 1. 20Calcio –CalciumMass: 40,078 u[Ar] 4s2Melting point: 1115 KBoiling point: 1757 KDensity: 1550 kg/m3Discovery: Humphry Davy, 1808Calcium is a soft gray alkaline earth metal, and is the fifth-most- abundant element bymass in the Earths crust. Calcium is also the fifth-most-abundant dissolved ion in seawater byboth molarity and mass, after sodium, chloride, magnesium, and sulfate .Calcium is essential for living organisms, in particular in cell physiology , where movement of thecalcium ion Ca2+ into and out of the cytoplasm functions as a signal for many cellular processes.As a major material used in mineralization of bone, teeth and shells , calcium is the most abundantmetal by mass in many animals.(in Spanish: calcio)