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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)
|Series:||alkaline earth metals|
|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|
|Density:||1.848 g / cm3|
|molar volume:||4,85 · 10-6 m3/ mol|
|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|
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?