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Calcium at Chemical Elements.com
Basic Information | Atomic Structure | Isotopes | Related Links | Citing This Page

Basic Information

Name: Calcium
Symbol: Ca
Atomic Number: 20
Atomic Mass: 40.078 amu
Melting Point: 839.0 °C (1112.15 K, 1542.2 °F)
Boiling Point: 1484.0 °C (1757.15 K, 2703.2 °F)
Number of Protons/Electrons: 20
Number of Neutrons: 20
Classification: Alkaline Earth
Crystal Structure: Cubic
Density @ 293 K: 1.55 g/cm3
Color: Silvery

Atomic Structure

[Bohr Model of Calcium]  
Number of Energy Levels: 4

    First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 8
    Fourth Energy Level: 2


Isotope Half Life
Ca-41103000.0 years
Ca-45162.7 days
Ca-474.5 days
Ca-498.7 minutes


Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: From the latin word calcis (lime)
Uses: life forms for bones and shells
Obtained From: chalk, limestone, marble. 3.5% of crust

Related Links

Note: The external links below are not a part of this site and their content is not the responsibility of this site
  1. Calcite
    • Information about calcium carbonate
  2. Healthworld Online - Calcium
    • Contains an "Introduction to Tungsten", among other things
If you know of any other links for Calcium, please let me know

MLA Format for Citing This Page

Bentor, Yinon. Chemical Element.com - Calcium. <http://www.chemicalelements.com/elements/ca.html>.

For more information about citing online sources, please visit the MLA's Website.

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