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H
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D
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Chemical Elements

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He
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N
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O
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F
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Ne
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Cs
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Md
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No
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Lr

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     20    

20 Ca Calcium

Alkaline earth metal, mass: 40.078 u, 5 stable isotopes (40, 42, 43, 44, 46), abundance rank (earth/space): 5/13

Click image to magnify. 0.5 grams calcium pieces. Original size per piece in cm: 0.1
Calcium Calcium pieces
Calcium is a very abundant element, which in nature above all occurs as calcium carbonate (CaCO3, lime) and calcium sulfate (CaSO4, gypsum). Elemental calcium is a grey metal, that slowly reacts with air and fiercely reacts with water. For humans and animals it is first of all important, because bones, teeth and exoskeletons to a large part consist of calcium compounds like tricalcium phosphate and calcium carbonate.

Shell
A seashell is largely made of CaCO3.


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The images are licensed under a Creative Commons Attribution 3.0 Unported License, unless otherwise noted. Attribution by linking (outside of the internet credit with url) to the according element page.



 


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