Symbol: Ca
Origin: From the word "al" or lime.
Discovery: The British Chemist Sir Humphry Davy isolated calcium in 1808 by means of electrolysis.
Properties: Calcium is ductile and malleable metal when exposed to the air rapidly tarnish to yellow. It reacts violently with water forming the hydroxide and releasing hydride. It is essential for bone and teeth development.
Uses: Plaster of Paris, deodorizer, batteries, Portland cement, medicine.
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