Name Beryllium
Symbol Be
Atomic Number 4
Atomic Mass 9.012 atomic mass units
Number of Protons 4
Number of Neutrons 5
Number of Electrons 4
Melting Point 278.0° C
Boiling Point 2970.0° C
Density 1.8477 grams per cubic centimeter
Normal Phase Solid
Family Alkaline Earth Metals
Period 2
Cost $530 per 100 grams



Origin of Name From the Greek word beryllos, a semi-precious stone (beryl)
Date and Place of Discovery In 1797 in Paris, France (as an oxide in beryl and emerald)
Discovered by Nicolas-Louis Vauquelin
It was isolated by Friedrich Wöhler in 1798.
Common Compounds
  • Beryllium fluoride (BeF2)
Interesting facts
  • It does not corrode (rust).
  • It is stronger than steel but is the lightest metal.
  • Its compounds are sweet tasting but are very toxic.
  • It transmits x-rays 17 times faster than aluminum.
  • It can be found in urine and blood.
Common Uses
  • Gyroscopes
  • Computer parts (shutters)
  • Aircraft
  • Missiles
  • Ceramics


Photo Courtesy of
Chemical Elements
Environmental Chemistry
Jefferson Lab

Beryllium Atomic Structure Elements by Name Elements by Number Home