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 …
钙 - 维基百科，自由的百科全书
钙（英語： Calcium ），是一種化學元素，化學符號为Ca，原子序數为20，原子量為 40.078 u 。 鈣是一種銀白色 碱土金属 ， 化學活性 頗高，暴露于空气下就会形成深色的氧化物和氮化物。
鈣 - 維基百科，自由的百科全書 - zh.wikipedia.org
鈣（英語： Calcium ），是一種化學元素，化學符號為Ca，原子序數為20，原子量為 40.078 u 。 鈣是一種銀白色 鹼土金屬 ， 化學活性 頗高，暴露於空氣下就會形成深色的氧化物和氮化物。
Calcium – Wikipedia
Calcium (eingedeutscht Kalzium geschrieben) ist ein chemisches Element mit dem Elementsymbol Ca und der Ordnungszahl 20. Im Periodensystem steht es in der zweiten Hauptgruppe, bzw. der 2. IUPAC-Gruppe und zählt daher zu den Erdalkalimetallen. Die Schreibweise Calcium entspricht der IUPAC-Norm und gilt als fachsprachlich. [15]
Calcium - Simple English Wikipedia, the free encyclopedia
Calcium forms chemical compounds in the +2 oxidation state. Calcium compounds are colorless. Most calcium compounds are not toxic. They are needed in the human body, actually. They are unreactive as far as calcium ions go. Calcium oxide was used to make limelights, which have a flame heating calcium oxide and makes it glow very bright. Calcium ...
Isotopes of calcium - Wikipedia
Calcium (20 Ca) has 26 known isotopes, ranging from 35 Ca to 60 Ca. There are five stable isotopes (40 Ca, 42 Ca, 43 Ca, 44 Ca and 46 Ca), plus one isotope (48 Ca) with such a long half-life that it is for all practical purposes stable.
Calcium supplement - Wikipedia
Calcium supplements are salts of calcium used in a number of conditions. [1] Supplementation is generally only required when there is not enough calcium in the diet. [2] [3] By mouth they are used to treat and prevent low blood calcium, osteoporosis, and rickets. [1]
Calcium metabolism - Wikipedia
Calcium regulation in the human body. [6]The plasma ionized calcium concentration is regulated within narrow limits (1.3–1.5 mmol/L). This is achieved by both the parafollicular cells of the thyroid gland, and the parathyroid glands constantly sensing (i.e. measuring) the concentration of calcium ions in the blood flowing through them.
Calcium in biology - Wikipedia
Plasma calcium levels in mammals are tightly regulated, [2] [3] with bone acting as the major mineral storage site. Calcium ions, Ca 2+, are released from bone into the bloodstream under controlled conditions. Calcium is transported through the bloodstream as dissolved ions or bound to proteins such as serum albumin.
Calcium | Definition, Properties, & Compounds | Britannica
2024年11月12日 · Calcium is essential to both plant and animal life and is broadly employed as a signal transducer, enzyme cofactor, and structural element (e.g., cell membranes, bones, and teeth). A large number of living organisms concentrate calcium in their shells or skeletons, and in higher animals calcium is the most abundant inorganic element. Many ...