Periodic table of the elements
BerylliumBoronCarbon
5
B
Boron
10.811
2
3
5
B
Boron
10.811
2
3
General
NameBoron
SymbolB
Number5
Chemical seriesMetalloids
Group / Period13 / 2
Blockp-block
CAS registry number7440-42-8

Physical properties
Statesolid
Density2.34 g/cm3
Melting point2349 K (2076 °C, 3769 °F)
Boiling point4200 K (3927 °C, 7101 °F)
Critical point

Atomic properties
Atomic Weight10.811 g/mol
Crystal structurerhombohedral
Electronegativity2.04
Atomic radius85 pm
Atomic radius (calculated)87 pm
Electron configuration[He] 2s2 2p1
Electrons per shell2, 3
Number of protons5
Number of neutrons6

Other languages
SpanishBoro
PortugueseBoro
FrenchBore
GermanBor
ItalianBoro
RussianБор
PolishBor
Chinese
Arabicبورون
TurkishBor
DutchBoor


Periodic table of the elements
BerylliumBoronCarbon