12 · Mg
Magnesium
Isolated by Davy in 1808. Magnesia, as an earth, was already known.
Identity
- Atomic number
- 12
- Symbol
- Mg
- Canonical name
- Magnesium
- Category
- alkaline earth metal
- Group
- 2
- Period
- 3
- 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
- 24.305 u
- Electron configuration
- [Ne] 3s2
- Electrons per shell
- 2, 8, 2
- Standard state
- solid
- Density
- 1.738 g/cm³
- Melting point
- 923 K
- Boiling point
- 1,363 K
- Electronegativity
- 1.31 Pauling
- First ionization energy
- 737.7 kJ/mol
- Electron affinity
- -40 kJ/mol
History
Electrolytic isolation
Isolation · confirmed · 1808
Davy isolates magnesium. White magnesia, as a compound, had already been distinguished.
Etymology
- Theme
- place
- Language
- grec
- Root
- Magnesia
- Meaning
- Magnesia
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