Periodic Table of Elements

12

Magnesium

24.305

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
2,8,2

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

Isotopes

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