Calcium

Ej Kelley Element (Calcium) Atomic number - 20 Atomic mass - 40.078 Melting point- 1115K (842 C or 1548 F) Boiling point - 1757K (1484 C or 2703 F) Density - 1.54 grams per cubic centimeter Phase at room temp - solid Element classification - metal Period 4, group 2, group name - Alkaline Earth Metal Protons - 20, Neutrons - 20, Electrons -2 Electron shell configuration- 1s2 2s2 2p6 3s2 3p6 4s2 Calcium is the fifth most abundant element in the earths crust. Metallic calcium was founded by Sir humphry Davy in 1808 through electrolysis of a mixture of lime (CaO) and mercuric oxide (HgO). Also the word calcium comes from the latin word calx and the element has 4 stable isotopes