5 B 10.81
Boron
metalloid
Properties
- Atomic number
- 5
- Atomic mass
- 10.81 u
- Category
- metalloid
- Group
- 13
- Period
- 2
- Block
- p-block
- State (room temp)
- Solid
- Outer-shell electrons
- 3
- Electronegativity
- 2.04 (Pauling)
- Density
- 2.08 g/cm³
- Melting point
- 2075.85 °C
- Boiling point
- 3926.85 °C
Electron configuration
1s² 2s² 2p¹
Noble-gas shorthand: [He] 2s² 2p¹
Electrons per shell: 2, 3 — that's 3 in the outermost shell.
About Boron
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.
- Discovered by Joseph Louis Gay-Lussac
- Appearance: black-brown
Position in the periodic table
Data compiled from Wikipedia, PubChem, and IUPAC. Source.