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Basic Information
Name: Magnesium
Symbol: Mg
Atomic Number: 12
Atomic Mass: 24.305 amu
Melting Point: 650.0 °C (923.15 °K, 1202.0 °F)
Boiling Point: 1107.0 °C (1380.15 °K, 2024.6 °F)
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]](Chemical Elements_com - Magnesium (Mg)_files/b0012.gif) |
Number of Energy Levels: 3 First Energy Level: 2 Second Energy Level: 8 Third Energy Level: 2 |
Isotopes
| Isotope | Half Life |
| Mg-24 | Stable |
| Mg-25 | Stable |
| Mg-26 | Stable |
| Mg-27 | 9.45 minutes |
| Mg-28 | 21.0 hours |
Facts
Date of Discovery: 1808
Discoverer: Sir Humphrey Davy
Name Origin: Magnesia (City)
Uses: airplanes, missiles
Obtained From: sea water