metalloid

/met"l oyd'/, n.
1. a nonmetal that in combination with a metal forms an alloy.
2. an element that has both metallic and nonmetallic properties, as arsenic, silicon, or boron.
adj.
3. of or pertaining to a metalloid.
4. resembling both a metal and a nonmetal.
[1825-35; METALL- + -OID]

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      a chemical element with properties intermediate between those of typical metals and nonmetals. Usually considered under this classification are the chemical elements boron, silicon, germanium, arsenic, antimony, and tellurium. The rare elements polonium and astatine are also sometimes included. Most of these elements are important industrial materials, being used to make transistors and other semiconductor devices, ceramics, solar batteries, and certain polymers.

      Metalloids are usually brittle, somewhat shiny solids that behave as electrical insulators at room temperature but become comparable to metals as electrical conductors when heated or when small quantities of certain elements are introduced into the lattices of their crystalline structures.

      Metalloids have electronic structures intermediate between the nearly empty outer electron shells of the typical metals and the nearly filled electron shells of the nonmetals. Thus, they have enough empty electron orbitals (pathways within the shells) into which electrons can be moved to conduct electric current. Their chemical properties are intermediate between the behaviour of electropositive and electronegative atoms.

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Universalium. 2010.

Look at other dictionaries:

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  • Metalloid — Met al*loid, n. [L. metallum metal + oid: cf. F. m[ e]tallo[ i]de.] (a) Formerly, the metallic base of a fixed alkali, or alkaline earth; applied by Sir Humphrey Davy to sodium, potassium, and some other metallic substances whose metallic… …   The Collaborative International Dictionary of English

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  • metalloid — Resembling a metal in at least one amphoteric form; e.g., silicon and germanium as semiconductors. [metal + G. eidos, resemblance] * * * met·al·loid met əl .ȯid n an element (as boron, silicon, or arsenic) intermediate in properties between the… …   Medical dictionary

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  • metalloid — I. noun Date: 1813 1. an element intermediate in properties between the typical metals and nonmetals 2. a nonmetal that can combine with a metal to form an alloy II. adjective also metalloidal Date: 1836 1. resembling a metal 2. of, relating to,… …   New Collegiate Dictionary

  • metalloid — met·al·loid || metÉ™lɔɪd n. element which is both metallic and nonmetallic; nonmetal adj. of metalloid (element which is both metallic and non metallic); resembling both a metal and a nonmetal …   English contemporary dictionary

  • metalloid — met•al•loid [[t]ˈmɛt lˌɔɪd[/t]] n. 1) mel a nonmetal that in combination with a metal forms an alloy 2) mel chem. an element with both metallic and nonmetallic properties, as silicon or boron 3) mel chem. of or pertaining to a metalloid 4) mel… …   From formal English to slang

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