Name Hydrogen
Symbol H
Atomic Number 1
Atomic Mass 1.00794 atomic mass units
Number of Protons 1
Number of Neutrons 0
Number of Electrons 1
Melting Point -259.14° C
Boiling Point -252.87° C
Density .08988 grams per cubic centimeter
Normal Phase Gas
Family Nonmetal
Period 1
Cost $1.00 per gram



Origin of Name From the Greek words hudôr, meaning water and gennan, meaning to generate
Date and Place of Discovery 1766 in England and in France
Discovered by Henry Cavendish and Antoine-Laurent de Lavoisier
Common Compounds
Interesting facts
  • It is the most abundant element in the universe.  It makes up 90% of all atoms.
  • It can be found in abundance in stars and gas giant planets like Jupiter.
  • It plays an important role in the powering of the universe through proton-proton reactions.
  • The United States produces about 3 billion cubic feet of hydrogen per year.
Common Uses
  • Hydrogenation of fats and oils
  • Methanol production
  • Rocket fuel
  • Welding
  • Hydrochloric acid
  • Reducing metallic ores
  • Filling balloons


Photo Courtesy of About.com
Chemical Elements
Chemistry: Web Elements
Elmhurst College
Jefferson Lab
Los Alamos National Laboratory

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