Magnesium

Alkaline earth metal · 24.305 u · group 2, period 3

Magnesium · Mg

Atomic number12

SymbolMg

CategoryAlkaline earth metal

Standard stateSolid

Group · Period · Block2 · 3 · s

Electron configuration[Ne]3s2

Atomic mass24.305 u

Atomic radius173 pm

Protons / Neutrons / Electrons12 / 12 / 12

Shells (e⁻ per shell)2, 8, 2

Electronegativity (Pauling)1.31

Ionization energy7.646 eV

Electron affinity—

Oxidation states+2

Melting point923 K · 649.9 °C

Boiling point1.36e+3 K · 1.09e+3 °C

Density1.74 g/cm³

Year discovered1808

CPK color

#8AFF00

State at room temp (25 °C)

solid

Position