Chemical Properties Of Calcium
Calcium is a trimorphic type of metal, which is harder than sodium but softer compared with aluminum. Unlike other alkaline metals, calcium is less chemically reactive and doesn't burn skin. Calcium combines with other elements to form certain compounds that are abundant in the earth's crust. Some of the natural forms of calcium are: limestone (CaCo3), fluorite (CaF2) and gypsum (CaSO4·2H2O). Apatite contains calcium in the fluorophosphates or chlorophosphate phase. When calcium comes in contact with air, it forms a coating of nitride and oxide to minimize further corrosion. When subjected to very high temperature in the air, calcium can burn to produce nitride. Chemical qualities of calcium - atomic configurations Calcium's symbol is "Ca" and has an atomic number 20, with atomic weight 40.078amu. The chemical qualities of calcium include its melting point, which is 839.0 +/- 2°C while its boiling point is 1484.0?C with a valence of 2. This means that calcium requirements more than 14 periods of required heat to boil water. This is only achievable with the use of special industry or laboratory equipment. The clear cut gravity of calcium is 1.55 equal to 20?C. A single atom of calcium contains 20 protons/electrons and 20 neutrons. Chemical qualities of calcium, furthermore, include a cubic crystal structure, a white silvery color, and a density of 1.55 g/cm3 at 293 K. Calcium has four energy levels, with electrons count of 2, 8, 8, and 2 respectively. Chemical qualities of calcium - the isotopes and corresponding half-life Ca-40 has a stable half life, Ca41 has a half life of 103,000 years, Ca-42 up to 44, 46 and 48 all have stable half lives, Ca-45 isotope's half life is 162.7 days, Ca47 has 4.5 days, and the shortest-lived isotope is Ca-49 with a half life of 8.7 minutes. Calcium easily combines with other element to form another compound making it a essential agent in a lot industries. In living species, calcium is important to maintain bone density among animals including humans. |
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