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Atomic mass, symbol and atomic number
boron is a naturally occurring element with the element symbol B and the atomic number 5. In the periodic table it stands with an atomic mass of 10.81 u in the 3rd main group. The chemical element discovered by Joseph Louis Gay-Lussac in 1808 is not radioactive and is in a solid state at room temperature.
Profile: Boron
| General | |
|---|---|
| Chemical element: | boron |
| Symbol: | B |
| Atomic number: | 5 |
| Group: | boron group |
| Period: | 2 |
| Block: | p-block |
| Series: | semimetals |
| Appearance: | black |
| explorers: | Joseph Louis Gay-Lussac |
| Year of discovery: | 1808 |
| Atomic properties | |
| Atomic mass: | 10,81 u |
| Atomic radius: | 85 pm |
| Covalent radius: | 82 pm |
| Van der Waals radius: | 192 pm |
| Electron configuration: | He 2s2 2p1 |
| ionization: | 800.6 kJ / mol |
| Physical Properties | |
| Physical state: | firmly |
| Density: | 2,460 g / cm3 |
| Crystal structure: | rhombohedrally |
| Magnetism: | diamagnetic |
| molar volume: | 4,39 · 10-6 m3/ mol |
| Mohs hardness: | 9,3 |
| Melting point: | 2076 ° C |
| Boiling point: | 3930 ° C |
| Heat of fusion: | 50 kJ / mol |
| Heat of vaporization: | 508 kJ / mol |
| Thermal conductivity: | 27 W |
| Chemical properties | |
| electronegativity: | 2,04 |
Did you know that ...
- Boron is the second hardest element after carbon (diamond)?
- Rocket fuel contains a certain amount of boron?
- elemental boron practically does not occur in nature?
- Boron is best detected by the so-called curcumin method?
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