Calcium

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Basic Information

Periodic Symbol: Ca

Atomic Number: 20

Atomic Weight: 40

Group: Alkaline Earth Metal

Period: 4

Color: Silvery White

Classification: Metallic

History

Discovered by Sir Humphrey Davy in England, 1808. It originated from the Latin word "calx", which means lime. It was available for large scale until the 20th century.

Uses

Calcium is found in limestone, gypsum, and fluorite. Needed in things like teeth, bones, leaves, and shells. It is also useful for setting broken bones.

Biology

Parts of bones and cell walls are made from calcium. Calcium is also a important part of blood clotting.

Geology

Naturally, calcium does not occur as a metal. It is found in minerals, like limestone. It makes up around 3% of the earth's crust.
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