20
Calcium
Atomic Number20
Atomic Mass40.078 u
CategoryAlkaline Earth
State at Room TempSolid
Year Discovered1808
About Calcium
The fifth most abundant element in Earths crust. Forms the mineral portion of bones and teeth. Calcium carbonate makes up limestone, chalk, marble, and seashells. Essential for blood clotting, muscle function, and nerve transmission. Dairy products are the best-known dietary source. The ocean floor is slowly being subducted and recycled through calcium minerals.
More Alkaline Earths
4
Beryllium
Extremely lightweight but very stiff. Used in the James Webb Space Telescopes mi...
12
Magnesium
The eighth most abundant element in Earths crust. Burns with an intensely bright...
38
Strontium
Named after the Scottish village of Strontian where it was discovered. Strontium...
56
Barium
Barium sulfate is used in barium meals to image the digestive tract. Barium comp...