Name Calcium
Symbol Ca
Atomic Number 20
Atomic Mass 40.078 atomic mass units
Number of Protons 20
Number of Neutrons 20
Number of Electrons 20
Melting Point 839.0 C
Boiling Point 1484.0 C
Density 1.55 grams per cubic centimeter
Normal Phase Solid
Family Alkaline Earth Metals
Period 4
Cost $11 per 100 grams



Origin of Name From the Latin word calcis, meaning lime
Date of Discovery 1808 in England
Discovered by Sir Humphry Davy
Common Compounds
Interesting facts
  • It is the 5th most abundant element found in the earth's crust.
  • It was prepared as lime by the Romans who called it "calyx," but it wasn't discovered until 1808.
  • It is not found free in nature.
  • It can be purified is not a soft silvery-white metal.
  • 99% of the human body's calcium is found in the teeth and bones.
Common Uses
  • Essential for the development of healthy teeth and bones
  • Used in woman past their child-bearing years in the treatment of osteoporosis
  • Fireworks
  • Plastics
  • Rodenticides
  • Torpedoes
  • Flares


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