12
Mg
Magnesium
Alkaline earth metal period 3 group 2 s-block discovered: 1808
As a chemical element
Properties of the atom — they do not depend on what substance it is part of.
- Atomic number
- 12
- Atomic mass
- 24.305 a.m.u.
- Electron configuration
- [Ne]3s2
- Electronegativity
- 1.31 on the Pauling scale
- Atomic radius
- 173 pm
- Ionization energy
- 7.646 eV
- Oxidation states
- +2
As a simple substance
Properties of the substance these atoms form under ordinary conditions.
- State at 25 °C
- Solid
- Melting point
- 923 K (649,85 °C)
- Boiling point
- 1363 K (1 089,85 °C)
- Density
- 1.74 g/cm³