Calcium (Ca)

Sara Brannon - 6th period

The Facts

  • Atomic #: 20
  • Atomic Mass: 40.078
  • Melting Point: 842 degrees Celsius
  • Boiling Point: 1284 degrees Celsius
  • # of Protons: 20
  • # of Neutrons: 20
  • # of Electrons: 20
  • Classification: metal
  • Cost: $11 per 100g
  • Family: Alkaline Earth Metal


  • Origin of Name: It comes from the Latin word "Calcius", meaning lime.
  • Year of Discovery: 1808
  • Discovered by: Sir Humphry Davy
  • Electron Configuration: 1s2 2s2 2p6 3s2 3p6 4s2

Interesting Tidbit!!

  1. Egyptian pyramids were built from limestone blocks. Limestone is crystalline calcium carbonate.
  2. Calcium ions are the most important messengers between cells and are absolutely vital for the existence of multicellular life forms.
  3. Calcium is used to remove oxygen, sulfur, and carbon from alloys.