|
Atomic symbol: Mg |
Atomic number: 12 |
Atomic weight: 24.305 |
Atomic volume: 13.97 cm3/mol |
Density: 1.738 g/cm3 |
Period Number: 3 |
Group number: 2 |
Group name: Alkali Earth |
Element classification: Metal |
Phase at room temperature: Solid |
Melting Point: 922 K |
Boiling point: 1378 K |
Heat of fusion: 8.954 kJ/mol |
Heat of vaporization: 127.40 kJ/mol |
Ionization Energy: 7.646 eV |
1st ionization energy: 737.7 kJ/mole |
2nd ionization energy: 1450.6 kJ/mole |
3rd ionization energy: 7732.6 kJ/mole |
Electronegativity: 1.31 |
Electron affinity: kJ/mole |
Specific heat: 1.02 J/gK |
Heat atomization: 148 kJ/mole atoms |
Shells: 2,8,2 |
Electron Shell Configuration: [Ne] 3s2 |
Minimum oxidation number: 0 |
Maximum oxidation number: 2 |
Minimum common oxidation number: 0 |
Maximum common oxidation no: 2 |
Appearance & Characteristics |
Structure:: hcp: hexagonal close pkd |
Color: silvery |
Hardness: 2 mohs |
Toxicity: ? |
Characteristics: burns brightly |
Uses: alloys, flash bulbs |
Reaction with air: vigorous,w/ht =>MgO,Mg3N2 |
Reaction with 6M HCl: mild, =>H2, MgCl2 |
Reaction with 15M HNO3: vigorous, =>NOx, Mg(NO3)2 |
Reaction with 6M NaOH: none |
Number of isotopes: 3 |
Oxide(s): MgO |
Hydride(s): MgH2 |
Chloride(s): MgCl2 |
Atomic Radius: 160 pm |
Ionic radius (1- ion): pm |
Ionic radius (1+ ion): pm |
Ionic radius (2- ion): pm |
Ionic radius (2+ ion): 86 pm |
Ionic radius (3+ ion): pm |
Thermal conductivity: 156 J/m-sec-deg |
Electrical conductivity: 224.719 1/mohm-cm |
Polarizability: 10.6 A^3 |
Source: Seawater, magnesite |
Relative abundance solar system: 6.031 log |
Abundance earth's crust: 4.4 log |
Estimated crustal abundance: 2.33×104 milligrams per kilogram |
Estimated oceanic abundance: 1.29×103 milligrams per liter |
|
|
|
(Magnesia, district in Thessaly) Compounds of magnesium have long been known. Black recognized magnesium as an element in 1755. Davy isolated it in 1808 and Bussy prepared it in coherent form in 1831. Magnesium is the eighth most abundant element in the earth's crust. It does not occur uncombined, but is found in large deposits in the form of magnesite, dolomite, and other minerals. |
The metal is now principally obtained in the U.S. by electrolysis of fused magnesium chloride derived from brines, wells, and sea water. |
Magnesium is a light, silvery-white, and fairly tough metal. It tarnishes slightly in air, and finely divided magnesium readily ignites upon heating in air and burns with a dazzling white flame. |
Organic magnesium is important in both plant and animal life. Chlorophylls are magnesium-centered perphyrins.
The adult daily nutritional requirement, which is affected by various factors include weight and size, is about 300 mg/day.
|
Uses include flashlight photography, flares, and pyrotechnics, including incendiary bombs. It is one third lighter than aluminum, and in alloys is essential for airplane and missile construction. The metal improves the mechanical, fabrication, and welding characteristics of aluminum when used as an alloying agent. Magnesium is used in producing nodular graphite in cast iron, and is used as an additive to conventional propellants.
It is also used as a reducing agent in the production of pure uranium and other metals from their salts. The hydroxide (milk of magnesia), chloride, sulfate (Epsom salts), and citrate are used in medicine. Dead-burned magnesite is employed for refractory purposes such as brick and liners in furnaces and converters.
|
|
Would you like to contact senior executives directly? Join our network on OurMetals.com
It's free and only takes 2 minutes to register. |
|
|
|
Company |
SEKOM Handelsges.m.b.H.... |
Our company is a private firm founded in 1990 with aim to develop export and import with Russia. We do promote EU industrial and consumer goods in Russia and strongly support marketing of Russian and CIS industrial products and services.
|
0 selling
&
0 buying
leads |
|
Friendly links
|
|