5B10.81
Boron
Metalloid
Solid at STP
Period 2Group 13Block PDiscovered 1808
[He]2s2 2p1
Boron is a metalloid chemical element with symbol B and atomic number 5. Produced entirely by cosmic ray spallation and supernovae and not by stellar nucleosynthesis, it is a low-abundance element in both the Solar system and the Earth's crust. Boron is concentrated on Earth by the water-solubility of its more common naturally occurring compounds, the borate minerals.
📖 Read more on Wikipedia →Atomic Properties
| Atomic Number | 5 |
| Atomic Mass | 10.81 u |
| Electron Configuration | [He]2s2 2p1 |
| Oxidation States | +3 |
| Electronegativity | 2.04 (Pauling) |
| Atomic Radius | 192 pm |
| Ionization Energy | 8.298 eV |
| Electron Affinity | 0.277 eV |
| Block | P |
Physical Properties
| Appearance | black-brown |
| Standard State | Solid |
| Melting Point | 2348 K (2074.8 °C) |
| Boiling Point | 4273 K (3999.8 °C) |
| Density | 2.37 g/cm³ |
| Molar Heat | 11.087 J/(mol·K) |
| CPK Color | #FFB5B5 |
Classification
| Category | Metalloid |
| Group Block | Metalloid |
| Period | 2 |
| Group | 13 |
| Block | P |
Discovery
| Year Discovered | 1808 |
| Discovered By | Joseph Louis Gay-Lussac |
| Electron Shells | 2, 3 |