Calcium Elemental Symbol

French German Italian Portuguese Spanish Swedish
Calcium Calcium Calcio Cálcio Calcio Kalcium

Calcium(Ca) atomic and molecular weight, atomic number and elemental symbolCalcium is a Block S, Group 2, Period 4 element. Elemental CalciumThe number of electrons in each of Calcium's shells is 2, 8, 8, 2 and its electron configuration is [Ar] 4s2. Calcium Bohr Model The calcium atom has a radius of and its Van der Waals radius is In its elemental form, CAS 7440-70-2, calcium has a dull gray-silver appearance. Calcium is a reactive, soft metal that is a member of the alkaline earth elements. It is found in the minerals dolomite, gypsum, plagioclases, amphiboles, pyroxenes and garnets. Calcium was discovered and first isolated by Sir Humphrey Davy in 1808. The name calcium originates from the Latin word 'calics' meaning lime.

Calcium's primary commercial application is as a reducing agent in the production of other metals. In iron and steel production it is added to the melt to remove oxygen, sulfur and carbon. Calcium is also used in small doses in alloys of copper and beryllium. Various calcium compounds have wide application in food, pharmaceutical and cosmetics. It is also used in dietary supplements because it has been shown to improve bone and dental health. High Purity (99.999%) Calcium (Ca)Sputtering TargetCalcium is available as metal and compounds with purities from 99% to 99.999% (ACS grade to ultra-high purity). Elemental or metallic forms include pellets, rod, wire and granules for evaporation source material purposes. High Purity (99.999%) Calcium Oxide (CaO) PowderCalcium nanoparticles and nanopowders provide ultra-high surface area which nanotechnology research and recent experiments demonstrate function to create new and unique properties and benefits. Oxides are available in powder and dense pellet form for such uses as optical coating and thin film applications. Oxides tend to be insoluble. Fluorides are another insoluble form for uses in which oxygen is undesirable such as metallurgy, chemical and physical vapor deposition and in some optical coatings. Calcium is also available in soluble forms including chlorides, nitrates and acetates. These compounds can be manufactured as solutions at specified stoichiometries.

Calcium is non-toxic and is an essential metal for living organisms. Safety data for Calcium and its compounds can vary widely depending on the form. For potential hazard information, toxicity, and road, sea and air transportation limitations, such as DOT Hazard Class, DOT Number, EU Number, NFPA Health rating and RTECS Class, please see the specific material or compound referenced in the Products tab below.

  • Properties
  • Safety Data
  • Products
  • Research
  • Isotopes
  • Other Elements

Calcium Properties

Symbol: Ca Melting Point: 842 oC, 1547.6 oF, 1115.15 K
Atomic Number: 20 Boiling Point: 1484 oC, 2703.2 oF, 1757.15 K
Atomic Weight: 40.08 Density: 1.55 gm/cc
Element Category: alkaline earth metal Liquid Density @ Melting Point: 1.378 g·cm−3
Group, Period, Block: 2, 4, s Specific Heat: 0.156 Cal/g/K @ 25°C
    Heat of Vaporization 150.6 kJ mol-1
CHEMICAL STRUCTURE Heat of Fusion 9.33 kJ mol-1
Electrons: 20 Thermal Conductivity: 2.01 W/cm/K @ 298.2 K
Protons: 20 Thermal Expansion: (25 °C) 22.3 µm·m−1·K−1
Neutrons: 20 Electrical Resistivity: 3.91 microhm-cm @ 0 °C
Electron Configuration: [Ar]4s2 Electronegativity: 1.0 Paulings
Atomic Radius: 197 pm Tensile Strength: N/A
Covalent Radius: 176±10 pm Molar Heat Capacity: 25.929 J·mol−1·K−1
Van der Waals radius: 231 pm Young's Modulus: 20 GPa
Oxidation States: 2, 1 (strongly basic oxide) Shear Modulus: 7.4 GPa
Phase: Solid Bulk Modulus: 17 GPa
Crystal Structure: face-centered cubic Poisson Ratio: 0.31
Magnetic Ordering: diamagnetic Mohs Hardness: 1.75
1st Ionization Energy: 589.83 kJ mol-1 Vickers Hardness: N/A
2nd Ionization Energy: 1145.46 kJ mol-1 Brinell Hardness: 167 MPa
3rd Ionization Energy: 4912.40 kJ mol-1 Speed of Sound: (20 °C) 3810 m·s−1
CAS Number: 7440-70-2 Abundance in typical human body, by weight: 14000000 ppb
ChemSpider ID: 4573905 Abundance in typical human body, by atom: 2200000 ppb
PubChem CID: 5460341 Abundance in universe, by weight: 70000 ppb
MDL Number: MFCD00085314 Abundance in universe, by atom: 2000 ppb
EC Number: 231-179-5 Discovered By: Humphry Davy
Beilstein Number: 4241647 Discovery Date: 1808
SMILES Identifier: [CaH2]  
InChI Identifier: InChI=1S/Ca Other Names: Cálcio, Kalcium

Calcium Products

Metal Forms  •  Compounds  •  Alloys  •  Oxide Forms  •  Organometallic Compounds
Sputtering Targets  •  Nanomaterials  •  Semiconductor Materials •  Isotopes

Metal Forms

Calcium Balls
Calcium Bands
Calcium Bar
Calcium Bits
Calcium Board
Calcium Briquette
Calcium Capsules
Calcium Coil
Calcium Coin
Calcium Concentrate
Calcium Cylinder
Calcium Disc
Calcium Dust
Calcium Flake
Calcium Flanges
Calcium Fluoride Sheet
Calcium Foil
Calcium Fragments
Calcium Grain
Calcium Granules
Calcium Ingot
Calcium Lump
Calcium Mesh
Calcium Metal
Calcium Microfoil
Calcium Microleaf
Calcium Nugget
Calcium Particles
Calcium Parts
Calcium Pebbles
Calcium Pellets
Calcium Pieces
Calcium Pills
Calcium Plate
Calcium Powder
Calcium Precipitate
Calcium Prism
Calcium Puck
Calcium Residue
Calcium Ribbon
Calcium Rings
Calcium Rocks
Calcium Rod
Calcium Samples
Calcium Scraps
Calcium Segments
Calcium Shaving
Calcium Sheet
Calcium Shot
Calcium Sleeves
Calcium Slugs
Calcium Specimens
Calcium Spheres
Calcium Spring
Calcium Strip
Calcium Tape
Calcium Tubes
Calcium Turnings
Calcium Wafer
Calcium Wire

Sputtering Targets

Calcium Sputtering Target
Calcium Fluoride Sputtering Target
Calcium Oxide Rotatable Sputtering Target
Calcium Phosphide Sputtering Target
Calcium Rotatable Sputtering Target
Calcium Selenide Sputtering Target
Calcium Silicate Sputtering Target
Calcium Sulfide Sputtering Target
Calcium Titanate Sputtering Target
Magnesium Calcium Sputtering Target
Praseodymium Calcium Manganate Sputtering Target

Oxide Forms

Calcium Oxide Nanopowder
Calcium Oxide Pellets
Calcium Oxide Pieces
Calcium Oxide Powder
Calcium Oxide Rotatable Sputtering Target
Calcium Oxide Sputtering Target
Calcium Oxide Tablets

Aluminum Calcium Sodium Silicate
Barium Calcium Tungsten Oxide
Bismuth Lead Strontium Calcium Copper Oxide
Bismuth Strontium Calcium Copper Oxide
Calcia Stabilized Zirconia
Calcium Acetate
Calcium Acetate Hydrate
Calcium Acetate Monohydrate
Calcium Acetate Solution
Calcium Aluminate
Calcium Arsenate
Calcium Boride
Calcium Borohydride
Calcium Borohydride/Magnesium Hydride
Calcium Bromate
Calcium Bromide
Calcium Bromide, Ultra Dry
Calcium Carbide
Calcium Carbonate
Calcium Cerium Fluoride
Calcium Chloride
Calcium Chloride Dihydrate
Calcium Chloride Hexahydrate
Calcium Chloride Pearl
Calcium Chloride Powder
Calcium Chloride Solution
Calcium Chloride, Ultra Dry
Calcium Chromate
Calcium Cobalt Oxide
Calcium Copper Titanate
Calcium Cyanamide
Calcium Ferrite
Calcium Fluoride
Calcium Fluoride, activated by Europium
Calcium Fluoride Beam Splitters
Calcium Fluoride Raman Substrates
Calcium Fluoride, Ultra Dry
Calcium Fluoride Window
Calcium Fluorophosphate Dihydrate
Calcium Fluorosilicate
Calcium Hydride
Calcium Hydroxide
Calcium Hypochlorite
Calcium Iodate
Calcium Iodate Monohydrate
Calcium Iodide
Calcium Iodide, Ultra Dry
Calcium Iodide Hydrate
Calcium Lanthanum Chromite
Calcium Lactate Pentahydrate
Calcium Lactate Hydrate
Calcium Lactate Anhydrous
Calcium Metaborate
Calcium Metasilicate
Calcium Molybdenum Oxide
Calcium Molybdate
Calcium Nitrate
Calcium Nitrate Hydrate
Calcium Nitrate Solution
Calcium Nitrate Tetrahydrate
Calcium Nitride
Calcium Oxalate
Calcium Oxalate Hydrate
Calcium Oxalate Monohydrate
Calcium Oxide
Calcium Perchlorate Tetrahydrate
Calcium Peroxide
Calcium Perrhenate
Calcium Phosphate
Calcium Phosphate Dibasic Anhydrous
Calcium Phosphate Dibasic Dihydrate
Calcium Phosphate Monobasic Monohydrate
Calcium Phosphate Tribasic
Calcium Pyrophosphate
Calcium Selenate
Calcium Selenite
Calcium Silicate
Calcium Silicate Bar
Calcium Silicate Board
Calcium Silicate Rod
Calcium Silicate Sheet
Calcium Silicide CaSi
Calcium Silicide CaSi2
Calcium Stannate
Calcium Stearate
Calcium Sulfate
Calcium Sulfate Dihydrate
Calcium Sulfate Solution
Calcium Sulfite
Calcium Tellurate
Calcium Tetrafluoroborate Hydrate
Calcium Thiocyanate Tetrahydrate
Calcium Titanate
Calcium Tungstate
Calcium Vanadate
Calcium Zirconate
Calcium Doped Lanthanum Chromite Paste
Lanthanum Calcium Manganite (LCM)
Palladium on Calcium Carbonate
Palladium on Calcium Carbonate, Poisoned with Lead
Neodymium Calcium Aluminate
Crystal/ Semiconductor Materials

Calcium Arsenide
Calcium Lanthanum Sulfide
Calcium Phosphide
Calcium Selenide
Calcium Sulfide
Calcium Telluride


Calcium Carbonate Microparticles
Calcium Carbonate Nanoparticles
Calcium Chloride Nanoparticles
Calcium Nanofoil
Calcium Nanoprisms
Calcium Oxide Nanopowder
Calcium Phosphate Nanoparticles
Calcium Titanate Nanopowder
Calcium Zirconate Nanopowder
Cerium Oxide, Calcium doped Nanopowder
Hydroxyapatite Nanopowder


Calcium 40 Carbonate Isotope
Calcium 42 Carbonate Isotope
Calcium 43 Carbonate Isotope
Calcium 44 Carbonate Isotope
Calcium 46 Carbonate Isotope


Aluminum Calcium Alloy
Calcium Aluminum Alloy
Calcium Magnesium Alloy
Calcium Silicon Alloy

Organometallic Compounds

Calcium 2-Ethylhexanoate
Calcium 2-Methoxyethoxide
Calcium Abietate
Calcium Acetylacetonate
Calcium Alginate
Calcium Benzoate
Calcium Benzoate Hydrate
Calcium Bis(2,2,6,6-tetramethyl-3,5-heptanedionate)
Calcium Borohydride bis(tetrahydrofuran)
Calcium Citrate
Calcium Citrate Malate
Calcium Citrate Tetrahydrate
Calcium D-Gluconate
Calcium D-Gluconate Monohydrate
Calcium D-Saccharate Tetrahydrate
Calcium Dodecylbenzene Sulfonate
Calcium Ethoxide
Calcium Formate
Calcium Fumarate
Calcium Gluceptate
Calcium Gluconate Monohydrate
Calcium Glycerophosphate
Calcium Glycerophosphate Hydrate
Calcium Isopropoxide
Calcium L-threonate
Calcium Lactobionate
Calcium Malate
Calcium Methoxide
Calcium Naphthenate
Calcium Octoate
Calcium Pantothenate
Calcium Propionate
Calcium Resinate
Calcium Succinate Monohydrate
Calcium Trifluoromethanesulfonate
Calcium Trifluoromethanesulfonimide

Recent Research & Development for Calcium

  • Cheng-Xiu Li, Yong-Hua Duan, Wen-Cheng Hu, Electronic structure, elastic anisotropy, thermal conductivity and optical properties of calcium apatite Ca5(PO4)3X (X = F, Cl or Br), Journal of Alloys and Compounds, Volume 619, 15 January 2015
  • Marta García-Maté, Angeles G. De la Torre, Laura León-Reina, Enrique R. Losilla, Miguel A.G. Aranda, Isabel Santacruz, Effect of calcium sulfate source on the hydration of calcium sulfoaluminate eco-cement, Cement and Concrete Composites, Volume 55, January 2015
  • Claire E. White, Luke L. Daemen, Monika Hartl, Katharine Page, Intrinsic differences in atomic ordering of calcium (alumino)silicate hydrates in conventional and alkali-activated cements, Cement and Concrete Research, Volume 67, January 2015
  • Linsheng Wan, Liang Yang, Yongming Chen, Lifu Zhao, Hongchao Li, Synthesis of scheelite with wolframite and calcium carbonate by a direct solid-state synthesis route, International Journal of Refractory Metals and Hard Materials, Volume 48, January 2015
  • Prasanna Padigi, Gary Goncher, David Evans, Raj Solanki, Potassium barium hexacyanoferrate – A potential cathode material for rechargeable calcium ion batteries, Journal of Power Sources, Volume 273, 1 January 2015
  • Stefan Schafföner, Christos G. Aneziris, Harry Berek, Björn Rotmann, Bernd Friedrich, Investigating the corrosion resistance of calcium zirconate in contact with titanium alloy melts, Journal of the European Ceramic Society, Volume 35, Issue 1, January 2015
  • E.J.C. Davim, M.H.V. Fernandes, A.M.R. Senos, Increased surface area during sintering of calcium phosphate glass and sodium chloride mixtures, Journal of the European Ceramic Society, Volume 35, Issue 1, January 2015
  • K. Illkova, P. Dobroň, F. Chmelík, K.U. Kainer, J. Balík, S. Yi, D. Letzig, J. Bohlen, Effect of aluminium and calcium on the microstructure, texture, plastic deformation and related acoustic emission of extruded magnesium–manganese alloys, Journal of Alloys and Compounds, Volume 617, 25 December 2014
  • Muhammad Naeem Ashiq, Raheela Beenish Qureshi, Muhammad Aslam Malana, Muhammad Fahad Ehsan, Synthesis, structural, magnetic and dielectric properties of zirconium copper doped M-type calcium strontium hexaferrites, Journal of Alloys and Compounds, Volume 617, 25 December 2014
  • Yan Vivian Li, Lawrence M. Cathles, Retention of silica nanoparticles on calcium carbonate sands immersed in electrolyte solutions, Journal of Colloid and Interface Science, Volume 436, 15 December 2014

Calcium Isotopes

Calcium has five stable isotopes: 40Ca, 42Ca, 43Ca, 44Ca and 46Ca

Nuclide Symbol Isotopic Mass Half-Life Nuclear Spin
40Ca 39.96259098 Observationally Stable 0+
42Ca 41.95861801 Stable 0+
43Ca 42.9587666 Stable 7/2-
44Ca 43.9554818 Stable 0+
46Ca 45.9536926 Observationally Stable 0+