Overview
Calcium is a reactive, silvery white metal that forms the basis of bones and teeth as calcium salts in biology.
Properties
It has moderate reactivity with water, forms ionic compounds and contributes to structural strength in alloys and minerals.
Occurrence and Uses
Abundant in limestone and gypsum, calcium compounds are used in cement, metallurgy, agriculture and as dietary supplements.
Isotopes and Safety
Stable isotopes include Ca 40, Ca 42 and others; calcium compounds vary in hazard and metallic calcium reacts with water and must be handled carefully.