Information

Beryllium (Be) - Properties


Atomic mass, symbol and atomic number

beryllium is a naturally occurring element with the element symbol Be and the ordinal number 4. In the periodic table it stands with an atomic mass of 9,012 u in the 2nd main group. The chemical element discovered by Louis-Nicolas Vauquelin in 1798 is not radioactive and is in a solid state at room temperature.

Profile: Beryllium (Beryllium)

General
Chemical element:beryllium
Symbol:Be
Atomic number:4
Group:2
Period:1
Block:s block
Series:alkaline earth metals
Appearance:grey black
explorers:Louis-Nicolas Vauquelin
Year of discovery:1798
Atomic properties <
Atomic mass:9,012 u
Atomic radius:105 pm
Covalent radius:96 pm
Van der Waals radius:153 pm
Electron configuration:Hey 2s2
ionization:899.5 kJ / mol
Physical Properties
Physical state:firmly
Density:1.848 g / cm3
Crystal structure:hexagonal
Magnetism:diamagnetic
molar volume:4,85 · 10-6 m3/ mol
Mohs hardness:5,5
Melting point:1287 ° C
Boiling point:2969 ° C
Heat of fusion:7.95 kJ / mol
Heat of vaporization:309 kJ / mol
Thermal conductivity:190 W
Chemical properties
electronegativity:1,57

Did you know that ...

  • the first glasses were cut from Beryllstein in the Middle Ages?
  • Beryllium is often mixed into alloys to improve hardness?
  • Emeralds to a substantial extent consist of beryllium?
  • Beryllium because of its sweet taste long time Glucinium was called?
  • Beryllium, despite its sweet taste, is extremely toxic and carcinogenic?