Calcium - Element #20

Alkaline Earth Metal

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Calcium was first isolated by Sir Humphry Davy in 1808. It's the 3rd most abundant metal in the Earth's crust, and has 10 different naturally occurring isotopes.

Periodic Table Info

  • Atomic #20 on the table
  • Atomic weight 40.078 grams
  • Melting Point: 1115 K / 842 C / 1548 F
  • Boiling Point: 1757 K / 1484 C / 2704 F
  • Solid reactive metal
  • Density: 1.54g/cm^3
  • Period 4, group 2
  • 20 protons, 20 neutrons, 20 electrons
  • Nuclide Notation: 40/20 CA
  • Hyphen Notation: Ca - 40
  • Part of the Alkaline Earth Metals. Some group properties are that they are lustrous, silvery white in color, found in the S-Block or Orbital of the Periodic Table, they're somewhat reactive with water, have a 2+ charge, and have a low density, boiling and melting points.

An Acrostic poem about Calcium









Calcium has a couple of different uses, but the main and important ones that I've found are for use in the refinement of Thorium, Uranium, and Zirconium. Calcium is also used to remove Oxygen, Carbon, and Sulfur from Alloys. The last use of pure Calcium I've found is for their use in vacuum tubes; Calcium combines with the trace gases produced in vacuum tubes and makes them inert or makes them no longer harmful.

Compounds or Bonds including Calcium

Calcium Carbonate (CaCO3)

Quick Lime (CaO)

Calcium Phosphate (Ca3[PO4]2)

Calcium Reaction and Bonding

Calcium is reacting with the oxygen to create Quick Lime.

It is a synthesis ionic bonding reaction, because two substances, and more specifically a metal and a non-metal are bonding together.

2Ca + O2 == 2CaO

1:1 mole ratio

Naturally Occurring Isotopes

  • Calcium 40: 96.941% abundance, 39.96259 grams, Nuclide Notation: 40/20 Ca, Hyphen notation: Calcium-40
  • Calcium 44: 2.086% abundance, 43.9554806 grams, Nuclide Notation: 44/20 Ca, Hyphen Notation: Calcium-44
  • Calcium 42: 0.647% abundance, 41.9586176 grams, Nuclide Notation: 42/20 Ca, Hyphen Notation: Calcium-42

Works Cited:

Thomas Jefferson National Accelerator Facility - Office of Science Education. "The Element Calcium." It's Elemental -. Jefferson Lab, n.d. Web. 09 May 2016. <>.

NCSSMDistanceEd. "Reaction of Calcium and Oxygen." YouTube. YouTube, 08 Dec. 2011. Web. 09 May 2016. <>.

Winters, Mark. "Calcium: Isotope Data." Calcium»isotope Data [WebElements Periodic Table]. The University of Sheffield and WebElements Ltd, UK, n.d. Web. 09 May 2016. <>.

Winters, Mark. "Calcium: Reactions of Elements." Calcium»reactions of Elements [WebElements Periodic Table]. [The University of Sheffield and WebElements Ltd, UK], n.d. Web. 09 May 2016. <>.

Boundless (2016). Boundless Chemistry. Retrieved from

Lenntech B.V. "Water Treatment Solutions." Calcium (Ca). Lenntech B.V., n.d. Web. 10 May 2016. <>.