56 · Ba
Barium
Baryta distinguished by Scheele in 1774, metal isolated by Davy in 1808.
Identity
- Atomic number
- 56
- Symbol
- Ba
- Canonical name
- Barium
- Category
- alkaline earth metal
- Group
- 2
- Period
- 6
- Block
- s
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
- 137.3277 u
- Electron configuration
- [Xe] 6s2
- Electrons per shell
- 2, 8, 18, 18, 8, 2
- Standard state
- solid
- Density
- 3.51 g/cm³
- Melting point
- 1,000 K
- Boiling point
- 2,118 K
- Electronegativity
- 0.89 Pauling
- First ionization energy
- 502.9 kJ/mol
- Electron affinity
- 13.954 kJ/mol
History
Baryta distinguished
Observation · confirmed · 1774
Scheele distinguishes baryta. He does not isolate barium metal.
Metal isolated
Isolation · confirmed · 1808
Davy isolates barium.
Etymology
- Theme
- property
- Language
- grec
- Root
- barys
- Meaning
- heavy
Scientists
Places and institutions
- 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