5

B

Boron

10.806

Semimetal
Solid

Discovery

Davy, Sir Humphry & Gay-Lussac, Louis-Joseph (1808)

Etymology

Arabic

Meaning

Refers to sodium borate

Electron configuration

Electron configuration

Crystal structure

Crystal structure

Rhombohedral

Physical Properties

Phase

  (at 21 °C and 101.325 kPa)

Solid

Melting point

  (at 101.325 kPa)

2300.0 °C

2573.15 K

Boiling point

  (at 101.325 kPa)

2550.0 °C

2823.15 K

Density

  (at 21 °C and 101.325 kPa)

2.34 g/cm3

Electronegativity

2.04