• Name: Calcium

  • Symbol: Ca

  • Number of Energy Levels: 4

  • Electrons on the outer energy level: 2

  • Atomic Number: 20

  • Atomic Mass: 40.078 Amu

  • Protons / Electrons: 20

  • Neutrons: 20

  • Density: 1.55 g/cm3

  • Classification: Alkaline Earth

Top 21 interesting facts about Calcium

  • Calcium was discovered in 1808 by Sir Humphrey Davy.
  • Its name derives from the Latin word "calcis" which means "lime".
  • Calcium is the 5th most abundant element in Earth's crust by mass and dissolved in sea-water.
  • Calcium is essential element in bones, teeth, and shells.
  • Calcium is a soft grey/silvery metal.
  • Calcium is the most abundant metal by mass in many living organisms.
  • Calcium is considered a reactive element.
  • Calcium is soft enough to be cut with a knife.
  • It is mainly extracted by electrolysis from calcium chloride.
  • Calcium reacts with air forming a grey oxide and nitride coating.
  • Calcium also reacts with water fast enough to be noticeable producing hydrogen gas.
  • Calcium is the lightest among Alkaline Earth metals.
  • Calcium has six stable isotopes 40-Ca, 42-Ca, 43-Ca, 44-Ca, 46-Ca, and 48-Ca.
  • The calcium isotope 40-Ca represents 97% of the naturally occurring calcium.
  • Calcium is used as a reduction agent in the extraction of other metals.
  • Calcium is used as a deoxidizer, desulfurizer, and decarbonizer for various alloys.
  • Calcium is used in the production of aluminum alloys (and many other alloys) as an alloying agent.
  • Calcium is used in construction industry for making cements and mortars.
  • Calcium is used in food industry in making of cheese as a milk coagulator.
  • About 99% of the calcium found in human body is stored in bones.
  • China, the USA, and India are the biggest producers of calcium.