Beryllium

Beryllium

Author of the description: 
Gruiz Katalin
Beryllium

Atomic number

4

Atomic mass

9.01218 g.mol -1

Electronegativity

1.5

Density

1.86 g.cm-3

Melting point

1280 °C

Boiling point

2970 °C

Vanderwaals radius

unknown

Ionic radius

unknown

Isotopes

1

Electronic shell

1s2 2s2 or [ He ] 2s2

Energy of first ionisation

899.2 kJ.mol -1

Energy of second ionisation

1757 kJ.mol -1

Standard potential

- 1.70 V

Discovered by

Abbé René-Just Hauy in 1798

 

Beryllium is a toxic bivalent element, steel gray, strong, light-weight, primarily used as hardening agent in alloys. Beryllium has one of the highest melting points of the light metals. It has excellent thermal conductivity, is nonmagnetic, it resists attack by concentrated nitric acid and at standard temperature and pressures beryllium resist oxidation when exposts to air.

Applications

Beryllium is used as an alloying agent in the production of beryllium-copper. Thanks to their electrical and thermal conductivity, high strenght and hardness, non magnetic properties, good resistance, dimensional stability over a wide temperature range beryllium-copper alloys are used in many applications. A typical application of beryllium-copper alloys is in the defense and aerospace industries.
Beryllium is also used in the field of X-ray detection diagnostic (it is transparent to X-rays) and in the making of various computer equipment.