Calcium Essay

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Name Date Sub Teacher Calcium The element Calcium on the peroidic table has the symbol of Ca. Calcium has an atomic number of 20. The atomic mass of Calcium is 40.078 amu. The melting point of calcium is 839.0* c - 1112.15 *k and the boiling point is 1484.0* c - 17757.15* k. The number of protons and electrons in Calcium is 20. The number of nuetrins is also 20 in Calcium. The crystal structure when it is hard is in cubic form and is silvery. The density is at 293 k: 1.55 g/cm3. Calcium is a solid when it is in room temperature. The atomic radius is 197 and atomic volume is 29.9 cc/mol. Covalent radius is 174 and the ionic radius is 99. The oxidation states is 2. Calcium has been known since the first century, when the ancient Romans were known to make lime from calcium oxide. The word Calcium comes from the word "calcis" in Latin which means "lime". It was purified as an element in 1808 by Sir Humphrey Davy. The romans prepared lime in the first century. Berzelius and Pontin prepared calcium amalgam by electrolyzing lime in mercury. Natural forms of calcium include limestone (CaCO3), gypsum (CaSO4), and fluorite (CaF2). Calcium is the 5th most abundant element on the Earth's crust and is preent at a level of 3% in the ocean and soil. Calcium can be purified into a soft silvery white alkaline earth metel. Calcium is used for making cement, cheese, removing nonmetallic impurities from alloys and as reducing agent in for preparing metals. Calcium also makes chalk, limestone, and marble. Pure calcium metal reacts vigorously and sometimes violently with water and acids. Calcium is used for coral calcium, calcium carbonate, chloride, citrate, carbide, and hydroxide. Calcium is also used in the making of sugar, glazes, paint, bricks, cement, paper, and glass. Calcium is found in living organisms. Plants use calcium to help

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