|
Sponsored Links
In chemistry, a metal (Greek Metallo, ??ta???) is a chemical element whose atoms readily lose electrons to form positive ions (cations), and form metallic bonds between other metal atoms and ionic bonds between nonmetal atoms.[1] Metals are sometimes described as a lattice of positive ions surrounded by a cloud of delocalized electrons. They are one of the three groups of elements as distinguished by their ionization 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. Most elements on this line are metalloids, sometimes called semi-metals; elements to the lower left are metals; elements to the upper right are nonmetals (see the periodic table showing the metals). An alternative definition[citation needed][unreliable source?] of metals is that they have overlapping conduction bands and valence bands in their electronic structure[2]. 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 (luster) of elemental metals. Metals are usually inclined to form cations through electron loss,[1] reacting with oxygen in the air to form oxides over changing timescales (iron rusts over years, while potassium burns in seconds). Examples
|
Metal Subcategories
Metal Articles
Precious Metal
by Wedding Star
Oct 30, 2008
Choosing a color for your wedding sets the tone for all the accessories and favors to follow. If you are looking for a classic look that won't seem dated years from now when you look back, choose colors that will stand the test of time in the form of...
Get hitched with the perfect wedding songs
by Tom Janison
Jul 20, 2007
Walking down the aisle with your favorite song playing in the background is something that everyone dreams of. And now fulfilling this dream has become all easier with the huge collection of wedding songs that one can find these days. Wedding is a m...
|
|
