Periodic Element Research

20

  Ca

 Calcium

   40.078

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 Metal

Crystal Structure: Cubic

Density @ 293 K: 1.55 g/cm³

Color: Silvery

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 4    Group Number: 2    

Name Origin: from the Latin word for lime, calx.

Atomic Structure:

Number of Energy Levels: 4

                                    First Energy Level: 2

                                    Second Energy Level: 8

                                    Third Energy Level: 8

                                    Fourth Energy Level: 2

            Calcium is almost always within a compound, due to its high reactivity with water and oxygen. Calcium Carbonate (Ca CO₃), also known as limestone, is one of the most common compounds in which calcium is formed. Also due to its high ability to react to oxygen and water, calcium in nature is never found as a metal. Humphry Davy chemically discovered the metal or metallic form or calcium.

Calcium is commonly recognized as the essential make up of bones and other common materials like shells and coral. It is used for lost of thins such as mixtures for cement, the material used for sculptures, roads, glass, marble, and chalk, however metallic calcium alone has very few used. Calcium is also the 5^th most common element in the earths crust, as well as the 5^th most abundant element in the human body.

http://www.chemistryexplained.com/elements/A-C/Calcium.html

Bentor, Yinon. Chemical Element.com - Calcium. Oct. 8, 2010 <http://www.chemicalelements.com/elements/ca.html>.