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MG
Magnesium (IPA: /magˈniːziəm, -ʒəm/) is the chemical element in the periodic table that has the symbol Mg and atomic number 12 and an atomic mass of 24.31. more...
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Magnesium is the eighth most abundant element and constitutes about 2% of the Earth's crust by weight, and it is the third most plentiful element dissolved in seawater. Magnesium ion is essential to all living cells. The free element (metal) is not found in nature. Once produced from magnesium salts, this alkaline earth metal is primarily used as an alloying agent to make aluminium-magnesium alloys, sometimes called "magnalium" or "magnelium".
Isotopes
26Mg is a stable isotope that has found application in isotopic geology, similar to that of aluminium. 26Mg is a radiogenic daughter product of 26Al, which has a half-life of 717,000 years. Large enrichments of stable 26Mg have been observed in the Ca-Al-rich inclusions of some carbonaceous chondrite meteorites. The anomalous abundance of 26Mg is attributed to the decay of its parent 26Al in the inclusions. Therefore, the meteorite must have formed in the solar nebula before the 26Al had decayed. Hence, these fragments are among the oldest objects in the solar system and have preserved information about it early history.
It is conventional to plot 26Mg/24Mg against an Al/Mg ratio. In an isochron dating plot, the Al/Mg ratio plotted is27Al/24Mg. The slope of the isochron has no age significance, but indicates the initial 26Al/27Al ratio in the sample at the time when the systems were separated from a common reservoir.
Notable characteristics of element and compounds
Elemental magnesium is a fairly strong, silvery-white, light-weight metal (two thirds the density of aluminium). It slightly tarnishes when exposed to air, although unlike the alkaline metals, storage in an oxygen free environment is unnecessary because magnesium is protected by a thin layer of oxide which is fairly impermeable and hard to remove. Like its lower periodic table group neighbor calcium, magnesium reacts with water at room temperature, though it reacts much more slowly than calcium. When it is submerged in water hydrogen bubbles will almost unnoticably begin to form on the surface of the metal, though if powdered it will react much more rapidly. The reaction will occur faster with higher temperatures (see precautions). Magnesium is a highly flammable metal, but while it is easy to ignite when powdered or shaved into thin strips, it is difficult to ignite in mass or bulk. Once ignited it is difficult to extinguish, being able to burn in both nitrogen (forming magnesium nitride), and carbon dioxide (forming magnesium oxide and carbon).
Read more at Wikipedia.org
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| |  | Mg 1968 Classic Rare California $2,000.00 | |
 | 1953 Mg T-Series Td- Gorgeous Yellow! $1,095.00 | |
| |  | 1970 Mgb Roadster Chrome Bumper Car $200.00 | |
 | 1974 Mgb Roadster, 54K Actual Miles! $8,000.00 | |
| |  | 1948 Mgtc - Easy Restoration Project $8,000.00 | |
 | 1971 Hot Roadster for the Countryside Drive $8,000.00 | |
| |  | 1976 Mg Midget! $200.00 | |
 | selling super rare 1939 Mg Tb Roadster $34,000.00 | |
| |  | 1969 Mg Gt $900.00 | |
 | mgb conv $766.00 | |
| |  | 1978 Mgb Roadster - Not Running - See Pictures $200.00 | |
 | Mg : Mgb $13,800.00 | |
| |  | 1972 Mgb Roadster - Sold new in S. Carolina still in Sc $2,375.00 | |
 | 1967 Mgb Gt No Reserve $2,000.00 | |
| |  | 1979-Orig 49K Miles Calif Car-No Rust-Limited Edition! $202.50 | |
 | Californiaclassix 1980 Mgb with 29K orig. Mls {64 Pix} $3,805.00 | |
| |  | Mg Roadster 1978 $2,500.00 | |
 | 1977 mgb convertible $2,075.00 | |
| |  | 1971 Mgb Gt Parts Car And Tons Of Parts!! Wire Wheels! $401.07 | |
 | 1952 Mg Td Rare California Rhd Mgtd Nice Original $13,550.00 | |
| |  | 1974 Mg Mgb Convertible $510.00 | |
 | 1978 Mgb Yellow Convertible $1,625.00 | |
| |  | Mgtd 1953 Lovely Black La Jolla Example, 4Th Owner $9,050.00 | |
 | Roadster; many new parts; good running condition $3,500.00 | |
| |  | 1973 Mg Midget Only 73K Needs Little Tlc, No Reserve!!! $401.00 | |
 | 1962 Mga 1600 Mark Ii Roadster $11,100.00 | |
| |  | Red Convertible '76 Mgb $2,500.00 | |
 | Mgtd Replica. Fabulous Looking And Driving $4,500.00 | |
| |  | 1961 Mga 1600 A Good California Car $6,655.55 | |
 | Classic -- 1968 Mg Midget $1,077.00 | |
| |  | 1952 Mg Td Restored About Six Years Ago $21,500.00 | |
 | 1977 Mgb - Chartreuse - Rubber Bumper $2,550.00 | |
| |  | 1979 Mgb convertible in racing green - 34,000 miles $7,000.00 | |
 | 1972 Mgb Roadster with 2 tops $2,000.00 | |
| |  | Classic Mg Convertible $4,500.00 | |
 | 1958 Mga Coupe 1 of 773 $10,200.00 | |
| |  | 1964 Mg Midget - Frame Up Restoration $4,900.00 | |
 | Mg / 1961 Mga Coupe 1600 Yellow With Tan Leather $14,600.00 | |
| |  | 1977 Mgb Roadster Convertible. Very Nice Original car. $4,100.00 | |
 | 61 Mga Mk11 Roadster - For Restoration $25,000.00 | |
| |  | 1960 Mga Roadster Restored 90k Orig pre-Mgb! Very Nice. $10,600.00 | |
 | 1952 Mgtd ,Frame Off Restored,Texas $15,101.00 | |
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Prices current as of last update, 01/22/09 10:43am.
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