Name Boron
Symbol B
Atomic Number 5
Atomic Mass 10.811 atomic mass units
Number of Protons 5
Number of Neutrons 6
Number of Electrons 5
Melting Point 2300.0 C
Boiling Point 2550.0 C
Density 2.34 grams per cubic centimeter
Normal Phase Solid
Family Metalloids
Period 2
Cost $5 per gram



Origin of Name From the Arabic word buraq and the Persian word burah, meaning borax
Date and Place of Discovery 1808 in Paris, France and in London, England
Discovered by In France: Joseph Louis Gay-Lussac and L. J. Thenard
In England: Sir Humphry Davy
Common Compounds
Interesting facts
  • It does not occur freely in nature in its elemental form.
  • It is found in borax, boric acid, colemanite, kernite, ulexite and borates.
  • It is sometimes found in volcanic spring waters.
  • Its compounds are being evaluated for the treatment of arthritis.
  • Almost 63% of the world's boron reserves are found in Turkey.
Common Uses
  • Borosilicate glass
  • Agriculture
  • Fire retardants
  • Soaps
  • Cosmetics
  • Deoxidizers
  • Insecticides against ants, fleas and cockroaches
  • Semiconductors
  • Fireworks (green color)


Photo Courtesy of
About: Chemistry
Chemical Elements
Jefferson Lab
Web Elements

Boron Atomic Structure Elements by Name Elements by Number Home