12 Mg 24.305
Magnesium
Alkaline Earth Metal
Magnesium (Mg) is a chemical element with atomic number 12, classified as a alkaline earth metal. At room temperature it is a solid. It was discovered in 1755 by Joseph Black.
Properties
- Atomic number
- 12
- Atomic mass
- 24.305 u
- Category
- Alkaline Earth Metal
- Group
- 2
- Period
- 3
- Block
- s-block
- Electron configuration
- [Ne] 3s²
- Phase at STP
- Solid
- Density
- 1.738 g/cm³
- Melting point
- 923 K (649.9 °C)
- Boiling point
- 1363 K (1089.8 °C)
- Electronegativity
- 1.31
- Atomic radius
- 145 pm
- Ionization energy
- 7.646 eV
- Discovery
- 1755 · Joseph Black
Common uses
Lightweight alloys, fireworks, antacids, photography flashes
Did you know?
Burns with brilliant white light and is essential for chlorophyll in plants.