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The chemical elements can be broadly divided into metals, metalloids, and nonmetals according to their shared physical and chemical properties.All elemental metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metallic elements; and have at least one basic oxide.
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, [2] as the term semimetal has a more common usage as a specific kind of electronic band structure of a substance.
This is a list of 194 sources that list elements classified as metalloids. The sources are listed in chronological order. Lists of metalloids differ since there is no rigorous widely accepted definition of metalloid (or its occasional alias, 'semi-metal'). Individual lists share common ground, with variations occurring at the margins.
The common oxide of selenium (SeO 3) is strongly acidic. Tellurium. Tellurium is a silvery-white, moderately reactive, [8] shiny solid, that has a density of 6.24 g/cm 3 and is soft (MH 2.25) and brittle. It is the softest of the commonly recognised metalloids.
In 1811, Berzelius referred to nonmetallic elements as metalloids, [17] [18] in reference to their ability to form oxyanions. [19] [20] A common oxyanion of sulfur, for example, is the sulfate ion SO 2− 4. Many metals can do the same. Chromium, for instance, can form the chromate ion CrO 2− 4.
The pseudo metals (groups 12 and 13, including boron) are said to behave more like true metals (groups 1 to 11) than non-metals. The hybrid metals As, Sb, Bi, Te, Po, At — which other authors would call metalloids — partake about equally the properties of both.
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Properties of metals, metalloids and nonmetals; S. Silicon; T. Tellurium This page was last edited on 26 September 2014, at 21:26 (UTC). Text is available under ...