The normal phase of calcium is a hard, silvery, metallic solid. However, it's never found in a free state and forms compounds, such as calcium carbonate, calcium phosphate and calcium fluoride.Continue Reading
The melting point of calcium is 1548 degrees Fahrenheit, and its boiling point is 2703 degrees F. It has an atomic number of 20. Its atomic weight is 40.078.
The ancient Romans used compounds of calcium to make cement and concrete, but it wasn't until 1808 that the English chemist Humphrey Davy isolated the pure metal.
Calcium is a better conductor of electricity than copper or aluminum, but it is not used in electrical wiring because of its reactivity. Calcium is a fairly reactive metal. If left in air, it reacts with nitrogen to form a skin of calcium nitride, which explodes if placed in water.
Calcium is essential to human and animal nutrition. Marine animals form their shells out of calcium carbonate. Calcium is also found in cell walls, teeth and bones. Vitamin D is necessary for calcium to be properly absorbed and utilized by the body. Calcium makes up a little over 3 percent of the Earth's crust and is the fifth most abundant element that is found there.Learn more about Chemistry