โ–ธโ–ธ
  • ๐Ÿ‡ฌ๐Ÿ‡ง Calcium
  • ๐Ÿ‡จ๐Ÿ‡ณ ้ˆฃ
  • ๐Ÿ‡ณ๐Ÿ‡ฑ Calcium
  • ๐Ÿ‡ซ๐Ÿ‡ท Calcium
  • ๐Ÿ‡ฉ๐Ÿ‡ช Calcium
  • ๐Ÿ‡ฎ๐Ÿ‡ฑ ืกื™ื“ืŸ
  • ๐Ÿ‡ฎ๐Ÿ‡น Calcio
  • ๐Ÿ‡ฏ๐Ÿ‡ต ใ‚ซใƒซใ‚ทใ‚ฆใƒ 
  • ๐Ÿ‡ต๐Ÿ‡น Cálcio
  • ๐Ÿ‡ท๐Ÿ‡บ ะšะฐะปัŒั†ะธะน
  • ๐Ÿ‡ช๐Ÿ‡ธ Calcio
  • ๐Ÿ‡ธ๐Ÿ‡ช Kalcium

Calcium: the essentials

Calcium atoms have 20 electrons and the shell structure is 2.8.8.2. The ground state electronic configuration of neutral calcium is [Ar].4s2 and the term symbol of calcium is 1S0.

Calcium: description  

Calcium as the element is a grey silvery metal. The metal is rather hard. Calcium is an essential constituent of leaves, bones, teeth, and shells. Calcium is the fifth most abundant element in the earth's crust and makes up more than 3% of the crust. Calcium does not occur as the metal itself in nature and instead is found in various minerals including as limestone, gypsum and fluorite. Stalagmites and stalactites contain calcium carbonate (CaCO3). Calcium carbonate is the basis of the cement industry.

Calcium is classified chemically as one of the alkaline earth elements (that is, in Group 2 of the periodic table. The metal is rather reactive. It readily forms a white coating of calcium nitride (Ca3N2) in air. It reacts with water and the metal burns with a yellow-red flame, forming largely the nitride.

calcium
This sample is from The Elements Collection, an attractive and safely packaged collection of the 92 naturally occurring elements that is available for sale.

Calcium: physical properties

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Calcium: heat properties

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Calcium: electronegativities

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Calcium: orbital properties

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Calcium: abundances

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Calcium: crystal structure

Ca crystal structure
The solid state structure of calcium is: bcc (body-centred cubic).

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Calcium: biological data

Calcium is essential for all life. It forms part of cell walls and bones. It is important for blood clotting.

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Calcium: uses

Uses...

Calcium: reactions

Reactions of calcium as the element with air, water, halogens, acids, and bases where known.

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Calcium: binary compounds

Binary compounds with halogens (known as halides), oxygen (known as oxides), hydrogen (known as hydrides), and other compounds of calcium where known.

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Calcium: compound properties

Bond strengths; lattice energies of calcium halides, hydrides, oxides (where known); and reduction potentials where known.

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Calcium: history

Calcium was discovered by Sir Humphrey Davy in 1808 at England. Origin of name: from the Latin word "calx" meaning "lime".

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Calcium: isotopes

Isotope abundances of calcium
Isotope abundances of calcium with the most intense signal set to 100%.

Calcium isotopes (mainly Ca-42, Ca-44, Ca-46 and Ca-48) are used extensively in clinical research and mainly in nutritional studies. They are used to measure calcium absorption mainly in women and children. In adults, calcium deficiency is strongly related to increasing severity of osteoporosis. In children, calcium deficiency is primarily related to the development of rickets. Ca-48 has been used to bombard Pb and Bi targets in order to create super heavy elements.

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Calcium: isolation

Isolation: calcium metal is readily available commercially and there is no need to make it in the laboratory. Commercially it can be made by the electrolysis of molten calcium chloride, CaCl2.

cathode: Ca2+(l) + 2e- → Ca

anode: Cl-(l) → 1/2Cl2 (g) + e-

The calcium chloride is made by the action of hydrochloric acid upon calcium carbonate. Calcium chloride is also a byproduct in the Solway process used to make sodium carbonate.

CaCO3 + 2HCl → CaCl2 + H2O + CO2

Alternatively, and on small scale, calcium can be made through the reduction of CaO with aluminium or of CaCl2 with sodium metal

6CaO + 2Al→ 3Ca + Ca3Al2O6

CaCl2 + 2Na→ Ca + 2NaCl