Calcium - Wikipedia
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 physical and chemical properties are most similar to its …
Calcium - Element information, properties and uses | Periodic Table
Element Calcium (Ca), Group 2, Atomic Number 20, s-block, Mass 40.078. Sources, facts, uses, scarcity (SRI), podcasts, alchemical symbols, videos and images.
Calcium | Definition, Properties, & Compounds | Britannica
2024年9月9日 · 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 most abundant element in Earth’s crust.
Calcium Element | History, Uses, Facts, Physical Chemical …
It is the fifth most abundant element in Earth’s crust and the third most abundant metal, after iron and aluminum. The atomic number of calcium is 20, and atomic weight is 40.078. The density of calcium is 1.55 grams per cubic centimeter. Its melting point …
Calcium Facts – Atomic Number 20 and Element Symbol Ca
2015年6月5日 · Calcium is the 20 th element of the periodic table. These calcium facts contain chemical and physical data along with general information and history.
Calcium (Ca) - Periodic Table
Calcium is the 20th element in the periodic table and has a symbol of Ca and atomic number of 20. It has an atomic weight of 40.078 and a mass number of 40. Calcium has twenty protons and twenty neutrons in its nucleus, and twenty electrons in four shells.
Calcium, Chemical Element - structure, reaction, water, uses, elements …
Calcium is the fifth most common element in the Earth's crust. Its abundance is estimated to be about 3.64 percent. It is also the fifth most abundant element in the human body. Calcium does not occur as a free element in nature. It is much too active and always exists as a compound.
Comprehensive Guide to Calcium: Properties, Uses, and Applications
Calcium is an element represented by the symbol "Ca" and has an atomic number of 20. It is an alkaline earth metal and is essential for living organisms to function. Generally, calcium is best known for its role in forming strong bones and teeth.
calcium summary | Britannica
calcium, Chemical element, one of the alkaline earth metal s, chemical symbol Ca, atomic number 20. The most abundant metallic element in the human body, it is an essential part of bone s and teeth and has many physiological functions (see calcium deficiency; tooth).
Calcium | Ca (Element) - PubChem
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. Never found in nature uncombined, it occurs abundantly as limestone, gypsum, and fluorite.