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
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