Calcium the Element

A look inside the life of an element

Basic Information

Symbol: Ca

Atomic Number: 20

Electron: 20

Protons: 20

Neutrons: 20

Charge: +2

Density: 1.54 g/cm3

Phase at Room Temperature: Solid

Element Classification: Metal

Period Number: 4

Group Number: 2

Group Name: Alkaline Earth Metals

Number of stable isotopes: 6

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Color: Silvery-white metal

Phase: Solid

Hardness: Relatively soft metal

Crystalline Structure: Cubic

Ductility: Calcium can be beaten into extremely thin sheets, it can be pressed, rolled, and cut

Malleability: Capable of being shaped or bent

Melting Point: 851 degrees

Boiling Point: 1482 degrees


Flammability: When heated in air or oxygen it ignites

Reacts with water: Reacts with cold water rapidly at first, but the reaction is then slowed due to the formation of calcium hydroxide

Reacts with acids: Highly reactive

Calcium and Water Reaction-Experiment

Compounds (uses)

  • when heated and added to water Calcium Carbonate forms slaked lime which is used throughout the chemistry industry
  • chalk, marble, lime stone are forms of Calcium Carbonate
  • used to make white paint, cleaning powder, tooth paste, and stomach antacids


  • drywall and plaster
  • plasters for broken limbs


  • naturally occurring in fertilizer


  • main material found in bones and teeth


  • refines elements
  • forms alloys
  • removes elements from certain alloys
  • calcium is used in vacuum tubes to remove traces of gas form the tubes


  • 5th most abundant element in the earth's core
  • never found free in nature because it easily forms compounds by reacting with oxygen and water
  • discovered by Humphry Davis in 1808
  • used to create the orange color in fire works
  • makes up 3.22% of the earth, air, and oceans
  • humans contain about 1 kg of calcium in their body