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Metalloid is a term used in chemistry when classifying the
chemical elements. On the basis of their general physical and chemical properties, nearly every element in the
periodic table can be termed either a metal or a
nonmetal - however a few elements with intermediate properties are referred to as metalloids. (In Greek language
metallon = metal and
eidos = sort)
There is no rigorous definition of the term, however the following properties are usually considered characteristic of metalloids:
- metalloids often form amphoterism oxides.
- metalloids often behave as semiconductors (B,Si,Ge) to semimetals (eg. Sb).
The concepts of metalloid and semiconductor should not be confused. Metalloid refers to the properties of certain
elements in relation to the periodic table. Semiconductor refers to the physical properties of
materials (including alloys, compounds) and there is only partial overlap between the two.
The following elements are generally considered metalloids:ACS Periodic Table.
Some
allotropes of elements exhibit more pronounced metal, metalloid or non-metal behavior than others. For example, for the element carbon, its diamond allotrope is clearly non-metallic, however the graphite allotrope displays limited electric conductivity more characteristic of a metalloid. Phosphorus, tin, selenium and
bismuth also have allotropes which display borderline behavior.
In the standard layout of the
periodic table, metalloids occur along the diagonal line through the p block from boron to astatine. Elements to the upper right of this line display increasing nonmetallic behaviour; elements to the lower left display increasing metallic behaviour. This line is called the "stair-step" or "staircase." The
poor metals are to the left and down and the
nonmetals are to the right and up. In addition, the halogens are found at the right.
{]!Carbon group!Pnictogen!Chalcogen!Halogen|- style="background:#ffccff; color:#999999; text-align:center"| style="background:#ff0000; color:#000000" | B
Boron| C
Carbon| N
Nitrogen| O
Oxygen| F
Fluorine|- style="background:#ffccff; color:#999999; text-align:center"| Al
Aluminium| style="background:#ff0000; color:#000000" | Si
Silicon| P
Phosphorus| S
Sulfur| Cl
Chlorine|- style="background:#ffccff; color:#999999; text-align:center"| Ga
Gallium| style="background:#ff0000; color:#000000" | Ge
Germanium| style="background:#ff0000; color:#000000" | As
Arsenic| Se
Selenium| Br
Bromine|- style="background:#ffccff; color:#999999; text-align:center"| In
Indium| Sn
Tin| style="background:#ff0000; color:#000000" | Sb
Antimony| style="background:#ff0000; color:#000000" | Te
Tellurium| I
Iodine|- style="background:#ffccff; color:#999999; text-align:center"| Tl
Thallium| Pb
Lead| Bi
Bismuth| style="background:#ff0000; color:#000000" | Po
Polonium| At
Astatine|}
References
Metalloid is a term used in chemistry when classifying the
chemical elements. On the basis of their general physical and chemical properties, nearly every element in the periodic table can be termed either a
metal or a nonmetal - however a few elements with intermediate properties are referred to as metalloids. (In
Greek language metallon = metal and
eidos = sort)
There is no rigorous definition of the term, however the following properties are usually considered characteristic of metalloids:
The concepts of metalloid and semiconductor should not be confused. Metalloid refers to the properties of certain
elements in relation to the periodic table. Semiconductor refers to the physical properties of
materials (including alloys, compounds) and there is only partial overlap between the two.
The following elements are generally considered metalloids:ACS Periodic Table.
Some allotropes of elements exhibit more pronounced metal, metalloid or non-metal behavior than others. For example, for the element
carbon, its diamond allotrope is clearly non-metallic, however the
graphite allotrope displays limited electric conductivity more characteristic of a metalloid.
Phosphorus,
tin, selenium and
bismuth also have allotropes which display borderline behavior.
In the standard layout of the periodic table, metalloids occur along the diagonal line through the
p block from boron to astatine. Elements to the upper right of this line display increasing nonmetallic behaviour; elements to the lower left display increasing metallic behaviour. This line is called the "stair-step" or "staircase." The poor metals are to the left and down and the
nonmetals are to the right and up. In addition, the halogens are found at the right.
{]!
Carbon group!Pnictogen!
Chalcogen!Halogen|- style="background:#ffccff; color:#999999; text-align:center"| style="background:#ff0000; color:#000000" | B
Boron| C
Carbon| N
Nitrogen| O
Oxygen| F
Fluorine|- style="background:#ffccff; color:#999999; text-align:center"| Al
Aluminium| style="background:#ff0000; color:#000000" | Si
Silicon| P
Phosphorus| S
Sulfur| Cl
Chlorine|- style="background:#ffccff; color:#999999; text-align:center"| Ga
Gallium| style="background:#ff0000; color:#000000" | Ge
Germanium| style="background:#ff0000; color:#000000" | As
Arsenic| Se
Selenium| Br
Bromine|- style="background:#ffccff; color:#999999; text-align:center"| In
Indium| Sn
Tin| style="background:#ff0000; color:#000000" | Sb
Antimony| style="background:#ff0000; color:#000000" | Te
Tellurium| I
Iodine|- style="background:#ffccff; color:#999999; text-align:center"| Tl
Thallium| Pb
Lead| Bi
Bismuth| style="background:#ff0000; color:#000000" | Po
Polonium| At
Astatine|}
References
Metalloid - Wikipedia, the free encyclopedia
Metalloid is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, nearly every element in the periodic ...
metalloid - Hutchinson encyclopedia article about metalloid
metalloid. Any chemical element having some of but not all the properties of metals; metalloids are thus usually electrically semiconducting. They comprise the elements germanium ...
metalloid
Any chemical element having some of but not all the properties of metals; metalloids are thus usually electrically semiconducting
Metalloid Corporation
Lubricants for coil forming, tube bending, fin stamping, and nonferrous metalworking from Metalloid Corporation
metalloid -- Britannica Online Encyclopedia
Britannica online encyclopedia article on metalloid: a chemical element with properties intermediate between those of typical metals and nonmetals. Usually considered under this ...
Chemical Elements.com - Metalloids
An up-to-date periodic table with detailed but easy to understand information
metalloid: Definition from Answers.com
metalloid ( ) n. A nonmetallic element, such as arsenic, that has some of the chemical properties of a metal
Definition: metalloid from Online Medical Dictionary
The Online Medical Dictionary is a searchable dictionary of definitions from medicine, science and technology.
Metalloid Corporation
Metalloid Corporation...Your single source supplier of Metalworking Fluids...Coolants, Stamping / Forming Fluids, Cleaners, Rust Inhibitors and more!
metalloid - definition of metalloid by the Free Online Dictionary ...
met·al·loid (m t l-oid) n. 1. A nonmetallic element, such as arsenic, that has some of the chemical properties of a metal. 2. A nonmetallic element, such as carbon, that can ...
