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.
Experiment with the elements
Beryllium doesn't form any compounds in our lab yet, but the periodic table sandbox lets you combine dozens of other real elements into real compounds — water, table salt, ammonia and many more — with their true chemical formulas.