Boron (B) — Element 5: Properties & Data | Aladdin Scientific
Boron(B) — Element 5
Boron (B) is a metalloid with atomic number 5 and atomic mass 10.81. It has melting point 2348 K (2075 °C), boiling point 4273 K (4000 °C), density 2.37 g/cm³. It sits in group 13 and period 2 of the periodic table and was discovered in 1808.
Key facts
| Atomic mass | 10.8100 u |
|---|---|
| Electron configuration | [He]2s2 2p1 |
| Oxidation states | +3 |
| Electronegativity (Pauling) | 2.04 |
| Atomic radius (van der Waals) | 192 pm |
| Ionization energy | 8.298 eV |
| Electron affinity | 0.277 eV |
| Melting point | 2348 K |
| Boiling point | 4273 K |
| Density | 2.37 g/cm³ |
| Standard state | Solid |
| Year discovered | 1808 |
Frequently asked questions
What is the electron configuration of boron?
The ground-state electron configuration of boron is [He]2s2 2p1.
What group and period is boron in?
Boron (B) is in group 13 and period 2 of the periodic table, classified as a metalloid.
What is the melting point of boron?
Boron melts at 2348 K (2075 °C).
What is the standard state of boron?
Boron is a solid at standard temperature and pressure.
Related elements
About this data: property values compiled from IUPAC Standard Atomic Weights (2021), the NIST Atomic Spectra Database, and PubChem. Curated by the Aladdin Scientific technical team. Last reviewed: .