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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)
| 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?
