Calcium is a chemical element; it has symbol Ca and atomic number 20. As an alkaline earth metal, calcium is a reactive metal that forms a dark oxide-nitride layer when exposed to air. Its …

Nov 28, 2025 · calcium (Ca), chemical element, one of the alkaline-earth metals of Group 2 (IIa) of the periodic table. It is the most abundant metallic element in the human body and the fifth …

Calcium was named after the Latin term calx meaning lime, and is a reactive silvery metallic element found in Group 2 of the periodic table. It was first isolated in 1808 in England when Sir …

Calcium, a metallic element, is fifth in abundance in the earth's crust, of which it forms more than 3%. It is an essential constituent of leaves, bones, teeth, and shells.

Calcium is an important element of the periodic table in biology, and medicine. Learn about calcium compounds, properties and uses, history, fun facts, and more!

The chemical element calcium is classed as an alkali earth metal. It was discovered in 1808 by Sir Humphry Davy.

Calcium was known as early as the first century when the Ancient Romans prepared lime as calcium oxide. Calcium was first isolated by Sir Humphry Davy in 1808 when he electrolyzed a …

Calcium is the fifth most abundant element in the earth's crust and makes up more than 3% of the crust. Calcium does not occur as the metal itself in nature and instead is found in various …

Calcium, a metallic element, is fifth in abundance in the earth's crust, of which it forms more than 3%. It is an essential constituent of leaves, bones, teeth, and shells.

Calcium is an alkaline earth metal and has been known since prehistoric times. It was discovered in 1787 by Antoine Lavoisier and was isolated in pure form in 1808. Calcium is important …