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Information valid for Mg-24 unless otherwise noted

Basic Information

Symbol: Mg
Atomic Number: 12
Mass: 24.305
Melting Point: 650.0 C
Boiling Point: 1107.0 C
Number of Protons/Electrons: 12
Number of Neutrons: 12
Classification: Alkaline Earth
Crystal Structure: Hexagonal
Density @ 293 K: 1.738 g/cm3
Color: grayish

Atomic Structure

[Bohr Model of Magnesium]
Number of Energy Levels: 3

  1. First Energy Level: 2
    Second Energy Level: 8
    Third Energy Level: 2


Isotope Half Life
Mg-24 Stable
Mg-25 Stable
Mg-26 Stable
Mg-27 9.45 minutes
Mg-28 21.0 hours


Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: Magnesia (City)
Uses: airplanes, missiles
Obtained From: sea water

Related Links

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  1. Magnesium In the Water Supply