Calcium

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 * 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

 * [[image:http://www.chemicalelements.com/bohr/b0020.gif width="277" height="275" caption="[Bohr Model of Calcium]"]] ||  || **Number of Energy Levels:** 4
 * First Energy Level:**
 * Second Energy Level:**
 * Third Energy Level:**
 * Fourth Energy Level:** ||

Isotopes

 * ** Isotope ** || ** Half Life ** ||
 * Ca-40 || Stable ||
 * Ca-41 || 103000.0 years ||
 * Ca-42 || Stable ||
 * Ca-43 || Stable ||
 * Ca-44 || Stable ||
 * Ca-45 || 162.7 days ||
 * Ca-46 || Stable ||
 * Ca-47 || 4.5 days ||
 * Ca-48 || Stable ||
 * Ca-49 || 8.7 minutes ||

=**Facts**= = =


 * 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 crus

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