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Metal

In chemistry, a metal (Greek: Metallon) is an element that readily forms positive ions (cations) and has metallic bonds. Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. more...

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The metals are one of the three groups of elements as distinguished by their ionisation and bonding properties, along with the metalloids and nonmetals. On the periodic table, a diagonal line drawn from boron (B) to polonium (Po) separates the metals from the nonmetals. Elements on this line are metalloids, sometimes called semi-metals; elements to the lower left are metals; elements to the upper right are nonmetals.

A modern definition of metals is that they have overlapping conduction bands and valence bands in their electronic structure. This definition opens up the category for metallic polymers and other organic metals, which have been made by researchers and employed in high-tech devices. These synthetic materials often have the characteristic silvery-grey reflectiveness of elemental metals.

The traditional definition focuses on the bulk properties of metals. They tend to be lustrous, ductile, malleable, and good conductors of electricity, while nonmetals are generally brittle (for solid nonmetals), lack lustre, and are insulators.

Occurrence

Nonmetal elements are more commonplace on Earth than metallic elements are, but metals in fact constitute most of the periodic table. Some popular metals are aluminum, copper, gold, iron, lead, silver, titanium, uranium and zinc.

Chemical properties

Most metals are chemically unstable, reacting with oxygen in the air to form oxides over varying timescales (for example iron rusts over years and potassium burns in seconds). The alkali metals react quickest followed by the alkaline earth metals, found in the leftmost two groups of the periodic table. The transition metals take much longer to oxidise (such as iron, copper, zinc, nickel). Others, like palladium, platinum and gold, do not react with the atmosphere at all. Some metals form a barrier layer of oxide on their surface which cannot be penetrated by further oxygen molecules and thus retain their shiny appearance and good conductivity for many decades (like aluminium, some steels, and titanium). The oxides of metals are basic (as opposed to those of nonmetals, which are acidic), although this may be considered a rule of thumb, rather than an absolute condition.

Painting or anodising metals are good ways to prevent their corrosion. However, a more reactive metal in the electrochemical series must be chosen for coating, especially when chipping of the coating is expected. Water and the two metals form an electrochemical cell, and if the coating is less reactive than the coatee, the coating actually promotes corrosion.

Read more at Wikipedia.org


Tobruk - Pleasure Pain_12"Lp Heavy Metal _Rare £4.00 Apocalypse - Apocalypse_12"Lp Heavy Metal £4.00
The Reverend Bizarre Goddess of Doom Limited 12 Inch £9.99 Dio Holy Diver 12" Vinyl Single £2.00
Billy Idol-interview-12"Picture Pic Disc £2.99 Meatloaf-Meat Loaf-12" Picture Pic Disc-Bat Out Of Hell £3.99
Megadeth-12"picture pic disc-holywars-Metallica-W asp £4.99 Hazel O'Conner D-Days 1981 Albion 12 Inch Single £3.99
Ac/Dc 7" Shake your foundations picture disc Acdc £10.00 Scorpions - Send Me An Angel 12" Single Unplayed £4.99
Metallica The Unnamed Feeling 12" Uk pic disc £8.99 Wasp Forever Free Original 1989 12" Single Poster Bag £3.99
Saxon Waiting For The Night Original 1986 12" Single £1.99 Metallica - Enter Sandman 12" 4 Track Demos etc £3.50
Exciter Feel The Knife Original 1985 12" Single *Rare* £5.99 Bon Jovi - Red hot & two parts live - Rare red vinyl £7.99
Bon Jovi - Livin on a prayer - Rare 1986 Green Vinyl £2.99 Bon Jovi - Livin on a prayer - Rare 1986 german import £4.99
Anthrax 5 x 12" colllection inc Indians Iam the Law £1.99 Motorhead 12" Beer Drinkers-1980/Big Beat £4.00
Ozzy Osbourne- Mama I'm coming - Rare 1991 promo 12" £1.99 Rare 12" pic disk Slaughter, up all night £4.99
W.A.S.P.-Sunset & Babylon - 3 Track x 12" Pic. Disc. Ex £3.99 Faith No More Digging The Grave 12" Ep Blue Vinyl Mint! £9.99
Red Hot Chilli Peppers Higher Ground Pic Disc New!!!!! £12.99 the Friday Rock show Lp Bbc Reh 426 rare heavy metal £3.99
Nikki Sudden - Crown of thorns - Rare Live Lp £19.99 Nikki Sudden - The jewl thief Lp inc Rem members £8.99
Krokus - heatstrokes / shy kid 12" 1980 £1.49 Gene Loves Jezebel - glad to be alive - Live Signed Lp £4.99
Santana - Festival - 1977 Us Promo Lp £7.99 Cowboy Junkies - Whites off earth now - Rare Live Lp £9.99
Robert Cray - Strong persuader White Label Promo Lp £4.99 Brute Force Lp - raven , diamondhead , sledgehammer etc £3.99
Testament Sins Of Chaos 12" Promo Ep In Ex Plus Rare. £9.99 Disturbed - Land of Confusion - Unplayed Pic / Disc £1.99
Pantera Walk 12" Ep Ex Plus Condition Rare! £9.99 Wrathchild - Nukklear Rokket - 12" Purple Vinyl -Nwobhm £1.99
Megadeth Anarchy In The Uk 12" Ep In Very Good Cond. £5.99 Megadeth Anarchy In The Uk 12" Etched Disc Mint Rare!! £14.99
Megadeth Train Of Consequences 12" Etched Disc Mint!! £10.99 onslaught picture disc let there be rock £3.99
Rare Oop Converge Hellchild split w/ Derek Hess poster £10.00 Creepin' Death_"Errare Humanum Es..."_12"Mx Heavy Metal £10.00
Faith No More-Patton-12" Picture Pic Disc-Midlife Crisi £1.99 Van Halen-12"When Its Love-Sealed With Free Patch £1.99
W.A.S.P. "i wanna be somebody" 12 " picture disc £3.00 Metallica "Garage Days Re-Revisited" Ultra Rare Holland £4.99
Soundgarden Ltd Edition Etched Disc Still Sealed £1.99
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Prices current as of last update, 11/17/08 8:50pm.


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