Name Oxygen
Symbol O
Atomic Number 8
Atomic Mass 15.999 atomic mass units
Number of Protons 8
Number of Neutrons 8
Number of Electrons 8
Melting Point -218.4 C
Boiling Point -183.0 C
Density 1.429 grams per cubic centimeter
Normal Phase Gas
Family Nonmetal
Period 2
Cost $.30 per 100 grams



Origin of Name From the Greek words oxus, meaning acid and gennan, meaning to generate
Date of Discovery In 1772 in Sweden by Scheele,
in 1774 in London, England by Priestly and
in 1778 in France by Lavoisier
Discovered by Carl Wilhem Scheele and Joseph Priestly
Antoine-Laurent de Lavoisier
See The Discovery of Oxygen
Common Compounds
Interesting facts
  • It is the third most abundant chemical element in the universe after hydrogen and helium.
  • It is the most common component of the earth's crust at 49%.
  • It is one of the two major components of air.
  • It is produced by plants during photosynthesis.
  • It is necessary for animals to breathe.
Common Uses
  • Oxidizer
  • Rocket propulsion
  • Medicine
  • Welding
  • Oxygen sensors
  • Oxygen masks
  • Oxygen concentrators
  • Steel production
  • Used in many synthetic chemicals (ammonia and alcohols) and plastics


Photo Courtesy of About.com
Answers. com
Chemical Elements
Facts About

Oxygen Atomic Structure Elements by Name Elements by Number Home