Science / Periodic Table of Elements / Magnesium (Mg): Atomic number: 12, Atomic mass: 24.305 g.mol -1, Electronegativity: 1.2, Density: 1.74 g.cm -3 at 20 °C, Melting point: 650 °C, Boiling point: 1107 °C, Vanderwaals radius: 0.16 nm, Ionic radius: 0.065 nm, Isotopes: 5, Electronic shell: [Ne] 3s2, Energy of first ionisation: 737.5 kJ.mol -1, Energy of second ionisation: 1450 kJ.mol -1, Standard potential: - 2.34 V, Discovered by: Sir Humphrey Davy in 1808. Chemical element, metallic, symbol Mg, situated in group IIa in the periodic table, atomic number: 12, atomic weight: 24,312. Magnesium is silvery white and very light. Its relative density is 1,74 and it’s density 1740 kg/m3 (0.063 lb/in3 or 108.6 lb/ft3). Magnesium is known for a long time as the lighter structural metal in the industry, due to it’s low weight and to it’s capability of forming mechanically resistant alloys. Magnesium is very chemically active, it takes the place of hydrogen in boiling water and a great number of metals can be produced by thermic reduction of its salts and oxidized forms with magnesium. It joins together with most non-metals and almost every acid. Magnesium reacts only slightly or not at all with most of the alkalis and many organic substances, like hydrocarbons, aldehides, alcohols, phenols, amines, esters and most of the oils. Used as a catalyst, magnesium promotes organic reactions of condensation, reduction, addition and dehalogenization. It was used for a long time for synthesizing special and complex organic components by the well-known Grignard reaction. The main ingredients of the alloys are: aluminum, manganese, zircon, zinc, rare-earth metals and thorium. Applications: Magnesium compounds are used as refractory material in furnace linings for producing metals (iron and steel, nonferrous metals), glass, and cement. With a density of only two thirds of the aluminum’s, it has countless applications in cases where weight reducing is important, i.e. in aeroplane and missile construction. It also has many useful chemical and metallurgic properties, which make it appropriate for many other non-structural applications. Magnesium components are widely used in industry and agriculture. Other uses include: removal of sulphur form iron and steel, photoengraved plates in the printing industry; reducing agent for the production of pure uranium and other metals from their salts; flashlight photography, flares, and pyrotechnics. Magnesium in the environment: Magnesium is the eighth most abundant element and constitutes about 2% af the Earth's crust by weight, and it is the third most plentiful element dissolved in seawater. It’s very abundant in nature, and it’s found in important quantities in many rocky minerals, like dolomite, magnetite, olivine and serpentine. It’s also found in seawater, underground brines and salty layers. It’s the third most abundant structural metal in the earth’s crust, only exceeded by aluminum and iron. The United States has traditionally been the major world supplier of this metal, supplying 45% of world production even as recently as 1995. Dolomite and magnesite are mined to the extent of 10 million tonnes per year, in countries such as China, Turkey, North Korea, Slovakia, Austria, Russia and Greece.
Health / Vitamins / Magnesium Oxide Crystals: Chemical compound with crystalline structure used in abrasive treatments of the skin for dead skin cells removal and wrinkle removal and rejuvenation, unlike aluminum oxide crystals, magnesium oxide i MORE
Science / Periodic Table of Elements / Magnesium (Mg): Atomic number: 12, Atomic mass: 24.305 g.mol -1, Electronegativity: 1.2, Density: 1.74 g.cm -3 at 20 °C, Melting point: 650 °C, Boiling point: 1107 °C, Vanderwaals radius: 0.16 nm, Ionic radius: 0. MORE