Periodic Table of Elements




Magnesium was discovered by Joseph Black, in England, in 1755. The element was isolated by A. A. B. Bussy and Sir Humphrey Davy in 1808.

Name: Magnesium
Symbol: Mg
Atomic number: 12
Atomic weight: 24.305
State: solid
Group, period, block: 2, 3, s
Color: shiny grey solid
Classification: alkaline earth metal
Electron configuration: 3s2

Physical properties

Density: 1.738 g.m-3
Melting point: 923 K, 650 C, 1202 F
Boiling point: 1363 K, 1091 C, 1994 F

Atomic properties

Oxidation states: 2, 1[1]
Electronegativity: 1.31 (Pauling scale)
Ionization energies: 1st: 737.7 kJmol-1
Covalent radius: 1417 pm
Van der Waals radius: 173 pm
  • Mg
  • Electron Configuration


There are three naturally occurring isotopes of magnesium exist, 24Mg, 25Mg, and 26Mg.