Calcium - Wikipedia
网页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 …
Calcium | Definition, Properties, & Compounds | Britannica
网页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, Chemical Element - structure, reaction, water, uses, …
网页Overview. 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, strontium, barium, and radium. The alkaline earth metals are more chemically active than most metals.
Calcium - Element information, properties and uses | Periodic Table
网页Calcium is a silvery-white, soft metal that tarnishes rapidly in air and reacts with water. Uses. Calcium metal is used as a reducing agent in preparing other metals such as thorium and uranium. It is also used as an alloying agent for aluminium, beryllium, copper, lead and magnesium alloys.
Chemistry of Calcium (Z=20) - Chemistry LibreTexts
网页2023年6月30日 · Calcium is the 20th element in the periodic table. It is a group 2 metal, also known as an alkaline-earth metal, and no populated d-orbital electrons. Calcium is the fifth most abundant element by mass (3.4%) in both the Earth's crust and in seawater. All living organisms require calcium for survival.
Calcium | Ca (Element) - PubChem
网页Calcium. Calcium is a chemical element with symbol Ca and atomic number 20. Classified as an alkaline earth metal, Calcium is a solid at room temperature.
Calcium: Chemistry, Analysis, Function and Effects
网页2015年10月6日 · This book will examine these roles and will also cover areas such as chemical analysis, sources of calcium based on geography, influence of Vitamin D, hypercalcemia and the effects of dietary calcium.
Calcium Element | History, Uses, Facts, Physical Chemical …
网页The chemistry of calcium is similar to heavy alkaline earth metal. The metal reacts slowly with oxygen, water vapor, and nitrogen of the air to form a yellow coating of the oxide, hydroxide, and nitride. It burns in air or pure oxygen to form the oxide and reacts rapidly with warm water to produce hydrogen gas and calcium hydroxide.
CHAPTER 5: The Chemistry of Calcium - Royal Society of Chemistry
网页2015年10月6日 · Calcium shows six stable isotopes and eighteen radioisotopes, many of which have been employed in biological studies. Stable isotopes are widely used for the investigation of calcium absorption, bioavailability and homeostasis, usually employing double-isotopic approaches and mass-spectrometry techniques.
Calcium - Periodic Table
网页Crystal Structure. Face Centered Cubic. History. 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 mixture of …