* Calcium permanganate, Ca ( MnO < sub > 4 </ sub >)< sub > 2 </ sub >

Calcium ion ( Ca < sup >++</ sup >) antagonists ( Calcium channel blockers ) are used in the treatment of chronic stable angina.

Calcium ( ) is the chemical element with symbol Ca and atomic number 20.

Calcium is essential for living organisms, in particular in cell physiology, where movement of the calcium ion Ca < sup > 2 +</ sup > into and out of the cytoplasm functions as a signal for many cellular processes.

Calcium salts are colorless from any contribution of the calcium, and ionic solutions of calcium ( Ca < sup > 2 +</ sup >) are colorless as well.

Calcium has four stable isotopes (< sup > 40 </ sup > Ca, < sup > 42 </ sup > Ca, < sup > 43 </ sup > Ca and < sup > 44 </ sup > Ca ), plus two more isotopes (< sup > 46 </ sup > Ca and < sup > 48 </ sup > Ca ) that have such long half-lives that for all practical purposes they also can be considered stable.

Calcium also has a cosmogenic isotope, radioactive < sup > 41 </ sup > Ca, which has a half-life of 103, 000 years.

* Calcium hydroxide solution ( Ca ( OH )< sub > 2 </ sub >) ( also known as limewater ) is used to detect the presence of carbon dioxide by being bubbled through a solution.

* Calcium arsenate ( Ca < sub > 3 </ sub >( AsO < sub > 4 </ sub >)< sub > 2 </ sub >) is used in insecticides.

* Calcium cyclamate ( Ca ( C < sub > 6 </ sub > H < sub > 11 </ sub > NHSO < sub > 3 </ sub >)< sub > 2 </ sub >) was used as a sweetening agent but is no longer permitted for use because of suspected cancer-causing properties.

* Calcium gluconate ( Ca ( C < sub > 6 </ sub > H < sub > 11 </ sub > O < sub > 7 </ sub >)< sub > 2 </ sub >) is used as a food additive and in vitamin pills.

* Calcium hypochlorite ( Ca ( OCl )< sub > 2 </ sub >) is used as a swimming pool disinfectant, as a bleaching agent, as an ingredient in deodorant, and in algaecide and fungicide.

* Calcium phosphate ( Ca < sub > 3 </ sub >( PO < sub > 4 </ sub >)< sub > 2 </ sub >) is used as a supplement for animal feed, fertilizer, in commercial production for dough and yeast products, in the manufacture of glass, and in dental products.

* Calcium phosphide ( Ca < sub > 3 </ sub > P < sub > 2 </ sub >) is used in fireworks, rodenticide, torpedoes and flares.

* Calcium stearate ( Ca ( C < sub > 18 </ sub > H < sub > 35 </ sub > O < sub > 2 </ sub >)< sub > 2 </ sub >) is used in the manufacture of wax crayons, cements, certain kinds of plastics and cosmetics, as a food additive, in the production of water resistant materials and in the production of paints.

Calcium sulfoaluminate cements are made from clinkers that include ye ' elimite ( Ca < sub > 4 </ sub >( AlO < sub > 2 </ sub >)< sub > 6 </ sub > SO < sub > 4 </ sub > or C < sub > 4 </ sub > A < sub > 3 </ sub > in Cement chemist's notation ) as a primary phase.

* Calcium Ca < sup > 2 +</ sup >

Calcium ( Ca ) is in group 2, for it contains 2 valence electrons.

* Calcium sulfide with strontium sulfide with bismuth as activator, ( Ca, Sr ) S: Bi, yields blue light with glow times up to 12 hours, red and orange are modifications of the zinc sulfide formula.

Calcium, with a density of 1. 55 g / cm < sup > 3 </ sup >, is the lightest of the alkaline earth metals ; magnesium ( specific gravity 1. 74 ) and beryllium ( 1. 84 ) are more dense, although lighter in atomic mass.

Calcium carbonate ( CaCO < sub > 3 </ sub >) is one of the common compounds of calcium.

* Calcium carbonate ( CaCO < sub > 3 </ sub >) is used in manufacturing cement and mortar, lime, limestone ( usually used in the steel industry ) and aids in production in the glass industry.

* Calcium carbide ( CaC < sub > 2 </ sub >) is used to make acetylene gas ( for use in acetylene torches for welding ) and in the manufacturing of plastics.

* Calcium chloride ( CaCl < sub > 2 </ sub >) is used in ice removal and dust control on dirt roads, in conditioner for concrete, as an additive in canned tomatoes, and to provide body for automobile tires.

* Calcium sulfate ( CaSO < sub > 4 </ sub >· 2H < sub > 2 </ sub > O ) is used as common blackboard chalk, as well as, in its hemihydrate form better known as Plaster of Paris.

* Calcium tungstate ( CaWO < sub > 4 </ sub >) is used in luminous paints, fluorescent lights and in X-ray studies.

:: Beryllium ( Z = 4 ), Magnesium ( Z = 12 ), Calcium ( Z = 20 ), strontium ( Z = 38 ), Barium ( Z = 56 ), Radium ( Z = 88 ).

* Wax Nails ( 1 Get Your Calcium, 2 Cereal Killer, 3 Seed, 4 The Crawling Backward Man, 5 In Good Hands, 6 How's Your House?

* Calcium sulfate, CaSO < sub > 4 </ sub > 60. 9

Calcium phosphate is the name given to a family of minerals containing calcium ions ( Ca < sup > 2 +</ sup >) together with orthophosphates ( PO < sub > 4 </ sub >< sup > 3 -</ sup >), metaphosphates or pyrophosphates ( P < sub > 2 </ sub > O < sub > 7 </ sub >< sup > 4 -</ sup >) and occasionally hydrogen or hydroxide ions.

* Calcium dihydrogen phosphate, E341 ( i ): Ca ( H < sub > 2 </ sub > PO < sub > 4 </ sub >)< sub > 2 </ sub >

* Calcium hydrogen phosphate, E341 ( ii ): CaHPO < sub > 4 </ sub >

* Calcium 3. 4 mg

To reduce the eutectic melting point in the solar molten salts the Calcium nitrate is used in this proportion, 42 % Ca ( NO < sub > 3 </ sub >)< sub > 2 </ sub >, 43 % KNO < sub > 3 </ sub > and 15 % NaNO < sub > 3 </ sub >.

* Calcium propanoate, Ca ( C < sub > 2 </ sub > H < sub > 5 </ sub > CO < sub > 2 </ sub >)< sub > 2 </ sub >

Calcium to phosphorus ratios should be 2: 1 to prevent hypocalcemia, sometimes known as hind leg paralysis ( HLP ).

Calcium released by basalts binds up CO < sub > 2 </ sub > from the atmosphere forming CaCO < sub > 3 </ sub > acting thus as a CO < sub > 2 </ sub > trap.

When the cement paste exposed to the air and meteoric water reacts with the atmospheric CO < sub > 2 </ sub >, portlandite and the Calcium Silicate Hydrate ( CSH ) of the hardened cement paste become progressively carbonated and the high pH gradually decreases from 13. 5 – 12. 5 to 8. 5, the pH of water in equilibrium with calcite ( calcium carbonate ) and the steel is no longer passivated.

** Calcium < 2 mmol / L

* Calcium < 2 mmol / L

* Distal convoluted tubule: Once leaving the loop of Henle the thick ascending limb can optionally reabsorb and re increase the concentration in the nephrons .< ref > Reabsorbing and increasing the concentration is done by optionally absorbing Potassium ( K < sup >+</ sup >) and Hydrogen ( H < sup >+</ sup >) anions, while releasing water and the continued pumping out of Calcium ( Ca < sup >+</ sup >) and salt ( Na < sup >+</ sup > and Chlorine Cl < sup >-</ sup > ions ).

Calcium and bicarbonate ions within the water are then able to combine, to form calcium carbonate ( CaCO < sub > 3 </ sub >) as a precipitate.

Calcium ( Ca < sup > 2 +</ sup >) plays a pivotal role in the physiology and biochemistry of organisms and the cell.

* Calcium Magnesium Acetate ( CaMg < sub > 2 </ sub >( CH < sub > 3 </ sub > COO )< sub > 6 </ sub >)