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A metal (from Greek μέταλλον métallon, "mine, quarry, metal"<ref>μέταλλον Henry George Liddell, Robert Scott, A Greek-English Lexicon, on Perseus Digital Library</ref><ref>metal, on Oxford Dictionaries</ref>) is a material (an element, compound, or alloy) that is typically hard, opaque, shiny, and has good electrical and thermal conductivity. Metals are generally malleable — that is, they can be hammered or pressed permanently out of shape without breaking or cracking — as well as fusible (able to be fused or melted) and ductile (able to be drawn out into a thin wire).<ref>metal. Encyclopædia Britannica</ref> About 91 of the 118 elements in the periodic table are metals (some elements appear in both metallic and non-metallic forms).

Astrophysicists use the term "metal" to collectively describe all elements other than hydrogen and helium. Thus, the metallicity of an object is the proportion of its matter made up of chemical elements other than hydrogen and helium.<ref name="Martin">{{#invoke:citation/CS1|citation |CitationClass=web }}</ref>

Many elements and compounds that are not normally classified as metals become metallic under high pressures; these are formed as metallic allotropes of non-metals.


Metal sections
Intro  Structure and bonding  Properties  Alloys  Categories  Extraction  Recycling of metals  Metallurgy  Applications  Trade   History   See also  References  External links  

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