4 Be 9.012
Beryllium
Alkaline Earth Metal
Beryllium (Be) is a chemical element with atomic number 4, classified as a alkaline earth metal. At room temperature it is a solid. It was discovered in 1798 by Louis Nicolas Vauquelin.
Properties
- Atomic number
- 4
- Atomic mass
- 9.012 u
- Category
- Alkaline Earth Metal
- Group
- 2
- Period
- 2
- Block
- s-block
- Electron configuration
- [He] 2s²
- Phase at STP
- Solid
- Density
- 1.85 g/cm³
- Melting point
- 1560 K (1286.8 °C)
- Boiling point
- 2742 K (2468.8 °C)
- Electronegativity
- 1.57
- Atomic radius
- 112 pm
- Ionization energy
- 9.323 eV
- Discovery
- 1798 · Louis Nicolas Vauquelin
Common uses
Aerospace alloys, X-ray windows, nuclear reactors
Did you know?
Extremely toxic but incredibly strong and lightweight - used in spacecraft.