5 · B
Boron
Prepared in 1808, independently, in Paris and in London.
Identity
- Atomic number
- 5
- Symbol
- B
- Canonical name
- Boron
- Category
- metalloid
- Group
- 13
- Period
- 2
- Block
- p
Properties
These quantities come from the Periodic Table JSON compilation. They have not yet been checked, one by one, against CIAAW atomic weights or NIST measurements. A value marked estimated is not a measurement.
- Atomic mass
- 10.81 u
- Electron configuration
- [He] 2s2 2p1
- Electrons per shell
- 2, 3
- Standard state
- solid
- Density
- 2.08 g/cm³
- Melting point
- 2,349 K
- Boiling point
- 4,200 K
- Electronegativity
- 2.04 Pauling
- First ionization energy
- 800.6 kJ/mol
- Electron affinity
- 26.989 kJ/mol
History
Boron prepared in Paris
Isolation · jointly credited · 1808
Gay-Lussac and Thénard prepare boron by reduction.
Boron prepared in London
Isolation · jointly credited · 1808
Davy obtains boron the same year, independently of the Paris work.
Etymology
- Theme
- mineral
- Language
- arabe
- Root
- buraq
- Meaning
- borax
Scientists
Places and institutions
- Paris — historical setting : France — present country : France
- London — historical setting : United Kingdom — present country : United Kingdom
See also
Sources
- IUPAC, Periodic Table of the Elements
- Bowserinator, Periodic Table JSON. Compilation secondaire d’où viennent les grandeurs physiques importées (masse, densité, températures, énergies). Elles ne sont pas revérifiées une à une auprès du NIST ou de la CIAAW.
- John Emsley, Nature’s Building Blocks: An A–Z Guide to the Elements