Metalloids

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Re: Metalloids

Post by VK KUMAR on Sun Sep 13, 2015 9:30 pm

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Re: Metalloids

Post by VK KUMAR on Sun Sep 13, 2015 9:25 pm

A metalloid is a chemical element with properties in between, or that are a mixture of, 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 the literature of chemistry.

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 may 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 the metalloids may be found close to this line.

Typical metalloids have a metallic appearance, but they are brittle and only fair conductors of electricity. Chemically, they mostly behave as 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, catalysts, flame retardants, glasses, optical storage and optoelectronics, pyrotechnics, semiconductors, and electronics.
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Re: Metalloids

Post by KIRTI on Sun Sep 13, 2015 12:26 pm

A metalloid is a chemical element with properties in between, or that are a mixture of, those of metals and nonmetals. Razz Very Happy
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.


Properties of Mettalloids

The chemical elements can be broadly divided into metals, metalloids and nonmetals according to their shared physical and chemical properties. All metals have a shiny appearance (at least when freshly polished); are good conductors of heat and electricity; form alloys with other metals; and have at least one basic oxide. Metalloids are metallic-looking brittle solids that are either semiconductors or exist in semiconducting forms, and have amphoteric or weakly acidic oxides. Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides. Most or some elements in each category share a range of other properties; a few elements have properties that are either anomalous given their category, or otherwise extraordinary.
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Metalloids

Post by Dishita Kaushik on Fri Sep 11, 2015 9:15 pm

●Unlike other families of elements such as noble gases, metalloids, alkali metals,halogens lie on diagonal rather than vertical line.
●Silicon is one of the most important elements used to make electronics.
●Arsenic is one of the most poisonous metals.
● Tellurium derived it's name from Latin word tell us which means earth. Smile Smile
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