Metallic Elements
A metal (from Greek "μέταλλον" – métallon, "mine, quarry, metal") is an element, compound, or alloy that is a good conductor of both electricity and heat. Metals are usually malleable, ductile and shiny. The meaning of the term "metal" differs for various communities (for example, astronomers call for convenience metals everything but hydrogen and helium, see Metallicity). Many elements and compounds that are not normally classified as metals become metallic under high pressures (see nonmetal#Metallic allotropes.)
Read more about Metallic Elements: Structure and Bonding, Alloys, Extraction, Recycling of Metals, Metallurgy, Applications, Trade, History
Famous quotes containing the words metallic and/or elements:
“Foster the labor of our country by an undeviating metallic currency ... always recollecting that if labor is depressed neither commerce nor manufactures can flourish, as they are both based upon the production of labor, produced from the earth, or the mineral world.”
—Andrew Jackson (1767–1845)
“Nature confounds her summer distinctions at this season. The heavens seem to be nearer the earth. The elements are less reserved and distinct. Water turns to ice, rain to snow. The day is but a Scandinavian night. The winter is an arctic summer.”
—Henry David Thoreau (1817–1862)