Atomic Properties of Mg
- Atomic Number of Mg
- 12
- Atomic Mass of Mg
- 24.3050 u
- Electron Configuration
- [Ne] 3s2
- Electronegativity
- 1.31
- Block
- s-block
- Group
- 2
- Period
- 3
Magnesium (Mg) is element 12 on the periodic table. Atomic mass of Mg: 24.3050 u. Mg is in period 3, group 2. Melting point of Mg: 923.00 K.Density of Mg: 1.74 g/cm³.
The element in chlorophyll that makes plants green
Essential for 300+ enzyme reactions. Central atom of chlorophyll. Needed for muscle and nerve function, blood sugar control, and DNA synthesis. Your body contains about 25g.
Discovered by Sir Humphrey Davy in England, 1808
Name origin: From Magnesia ancient city in district of Thessaly, Greece.
Silvery metallic element belonging to group 2 of the periodic table (alkaline-earth metals). It is essential for living organisms, and is used in a number of light alloys. Chemically very reactive, it forms a protective oxide coating when exposed to air and burns with an intense white flame. It also reacts with sulphur, nitrogen and the halogens. First isolated by Bussy in 1828.
Magnesium has 3 naturally occurring isotopes.
| Isotope | Atomic Mass (u) | Abundance | Half-Life | Decay Mode |
|---|---|---|---|---|
| 2412Mg (Mg-24)Magnesium-24 isotope | 23.9850417 | 78.99% | — | — |
| 2512Mg (Mg-25)Magnesium-25 isotope | 24.98583698 | 10.00% | — | — |
| 2612Mg (Mg-26)Magnesium-26 isotope | 25.98259297 | 11.01% | — | — |
Data source: NIH PubChem (aggregated from IUPAC, NIST)
Isotopes of Magnesium have important real-world applications in science and industry.
26Mg is a stable isotope and is the radiogenic product of 26Al decay. 26Al is produced by cosmic rays in space and in the atmosphere, and it was present in the primordial solar nebula. The anomalous abundance of 26Mg in meteorite inclusions indicate that this material must have been formed early in the development of the Solar System before all primordial 26Al (with half-life of 7.1×105 years) had decayed [116].
Used in alloys to make airplanes, missiles and other uses for light metals. Has structural properties similar to aluminium. But since it is flammable at temperatures of burning gasoline, its uses are limited.
Usually obtained by electrolysis of melted magnesium chloride (MgCl2) found in sea water. Each cubic mile of seawater contains about 12 billion pounds of magnesium.
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