Boron (B)
Element 5 Ā· Metalloid
Boron (B) is a chemical element with atomic number 5. It is classified as a metalloid in period 2, group 13 of the periodic table (the p-block). Its standard atomic weight is 10.81 u and its ground-state electron configuration is [He] 2sĀ² 2pĀ¹.
Boron facts
| Atomic number (Z) | 5 |
|---|---|
| Symbol | B |
| Standard atomic weight | 10.81 u |
| Category | Metalloid |
| Group | 13 |
| Period | 2 |
| Block | p-block |
| Electron configuration | [He] 2sĀ² 2pĀ¹ |
| Electronegativity (Pauling) | 2.04 |
| State at 20 Ā°C | Solid |
| Protons / electrons | 5 / 5 |
| Neutrons (most common isotope, approx.) | 6 |
| Molar mass | 10.81 g/mol |