2. By: Ashlee http://www.dayah.com/pe riodic/

3.  Silvery white metallic  Metal  Conductor  Corrosive  Melting point: 839.0 C  Boiling point: 1484.0 C

4. Structure: Ccp( Cubic Closed- Pack)

5.  Atomic number:20  Atomic weight:40.08  Protons:20  Neutrons:20  Symbol: Ca

6.  Block: S  Period: 4  Group: 2  Electron Configuration:  [Ar].4s 2

7.  Can be obtained from: Chalk, limestone and marble.  Is found in 3.5% of Earth’s crust.  Bones, teeth and shells are formed by calcium.

8.  found as calcium sulfate in alabaster and gypsum, calcium fluoride in fluorite, or as calcium phosphate in rock phosphate

9.  In nature, calcium is found in rocks, chalk and seashells.  It is found in the bones, muscles and nerves of many animals and plants.  Calcium is abundant.

10.  Its has a slightly grayish appearance when it is first cut.  Then the air tarnishes it to show a duller finish.  Reacts with water.

11. Its compounds are used to make plaster, and metallurgic and electronic materials. http://www.yout ube.com/watch ?v=HSV3jOccyY s