12
Mg
24.305
Magnesium
Element 12 · 24.305 u · s-block
alkaline earth
A lightweight structural metal. Burns with a brilliant white flame and is essential for chlorophyll in plants.
Phase (STP)
Solid
Melting Point
650 °C
Boiling Point
1091 °C
Density
1.738 g/cm³
Electronegativity
1.31
Atomic Radius
150 pm
Ionization Energy
738 kJ/mol
Electron Affinity
0 kJ/mol
Discovered
1755 · Joseph Black
Electron Configuration
[Ne] 3s2
Electron Orbitals
Drag to rotate · Pinch to zoom