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• Metalloid abstract "A metalloid is a chemical element that has properties in between those of metals and nonmetals. There is no standard definition of a metalloid, nor is there complete agreement as to which elements are appropriately classified as such. Despite this lack of specificity the term remains in use in chemistry literature.The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Elements less commonly recognised as metalloids include carbon, aluminium, selenium, polonium and astatine. On a standard periodic table all of these elements can be found in a diagonal region of the p-block, extending from boron at one end to astatine at the other. Some periodic tables include a dividing line between metals and nonmetals and it is generally the elements adjacent to this line or, less often, one or more of the elements adjacent to those elements, which are identified as metalloids.Typical metalloids have a metallic appearance but they are brittle and only fair conductors of electricity. Chemically, they mostly behave as (weak) nonmetals. They can form alloys with metals. Most of their other physical and chemical properties are intermediate in nature. Metalloids are usually too brittle to have any structural uses. They and their compounds are used in alloys, biological agents, flame retardants, glasses, optical storage, pyrotechnics, semiconductors and electronics. The electrical properties of silicon and germanium enabled the establishment of the semiconductor industry in the 1950s and the development of solid-state electronics from the early 1960s.The term metalloid originally referred to nonmetals. Its more recent meaning, as a category of elements with intermediate or hybrid properties, became widespread in 1940–1960. Metalloids are sometimes called semimetals, a practice that has been discouraged as the term semimetal has a different meaning in physics than in chemistry. In physics it more specifically refers to the electronic band structure of a substance.Broadly, the recognised metalloids occupy middle ground in terms of their abundance, extraction methods, and costs. Silicon is the second most abundant element in the Earth's crust after oxygen; tellurium is rarer than gold, but more abundant than rhenium, the rarest of the stable metals. Extraction can be achieved by ordinary chemical reduction of the oxides or sulfides.".
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• Metalloid wikiPageID "85425".
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• Metalloid b "2".
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• Metalloid hasPhotoCollection Metalloid.
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• Metalloid subject Category:Metalloids.
• Metalloid subject Category:Periodic_table.
• Metalloid comment "A metalloid is a chemical element that has properties in between those of metals and nonmetals. There is no standard definition of a metalloid, nor is there complete agreement as to which elements are appropriately classified as such. Despite this lack of specificity the term remains in use in chemistry literature.The six commonly recognised metalloids are boron, silicon, germanium, arsenic, antimony and tellurium.".
• Metalloid label "Halbmetalle".
• Metalloid label "Metalloid".
• Metalloid label "Metalloïde".
• Metalloid label "Métalloïde".
• Metalloid label "Półmetale".
• Metalloid label "Semimetal".
• Metalloid label "Semimetal".

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