Periodic table of the elements
LithiumBerylliumBoron
4
Be
Beryllium
9.012182
2
2
4
Be
Beryllium
9.012182
2
2
General
NameBeryllium
SymbolBe
Number4
Chemical seriesAlkaline earth metals
Group / Period2 / 2
Blocks-block
CAS registry number7440-41-7

Physical properties
Statesolid
Density1.85 g/cm3
Melting point1560 K (1287 °C, 2349 °F)
Boiling point2742 K (2469 °C, 4476 °F)
Critical point

Atomic properties
Atomic Weight9.012182 g/mol
Crystal structurehexagonal
Electronegativity1.57
Atomic radius105 pm
Atomic radius (calculated)112 pm
Electron configuration[He] 2s2
Electrons per shell2, 2
Number of protons4
Number of neutrons5

Other languages
SpanishBerilio
PortugueseBerílio
FrenchBéryllium
GermanBeryllium
ItalianBerillio
RussianБериллий
PolishBeryl
Chinese
Arabicبيريليوم
TurkishBerilyum
DutchBeryllium


Periodic table of the elements
LithiumBerylliumBoron