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 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 …

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

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!

4 days ago · Calcium is a chemical element with the symbol Ca and atomic number 20. It is an alkaline earth metal, positioned in Group 2 of the periodic table. Calcium plays an essential …

Chemical element, Calcium, information from authoritative sources. Look up properties, history, uses, and more.

Soft grey metallic element belonging to group 2 of the periodic table. Used a reducing agent in the extraction of thorium, zirconium and uranium. Essential element for living organisms. Calcium …

Calcium is an alkaline earth metal. The alkaline earth metals make up Group 2 (IIA) of the periodic table, a chart that shows how the elements are related. They include beryllium, magnesium, …