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From Wikipedia

Metalloid

Metalloid is a term used in chemistry when classifying the chemical elements. The term semimetal is sometimes used synonymously, but this is sometimes defined differently. 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 (from the Greekmetallon = "metal" and eidos = "sort"). The line that separates metalloids from nonmetals in the periodic table is referred to as the "amphoteric line".

There is no rigorous definition of the term, but 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:

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, but the graphite allotrope displays limited electric conductivity more characteristic of a metalloid. Phosphorus, selenium, tin, and bismuth also have allotropes that display borderline behavior.

In the standard layout of the periodic table, metalloids occur along the diagonal line through the p block from boron to polonium. 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.



From Yahoo Answers

Question:I have this science test tomorrow and I REALLY don't get the Periodic Table. I need some help. ANYTHING. For example, what are halogens? their properties? what are noble gases? what are their properties?

Answers:ok... Left side of the periodic table is metals. Right side is non metals. the dark like that always shows up and makes a zig-zap 3/4 of the way on the table shows the separation. Every element that touches that line is a metaloid Metals are shiny, ductile, malleable, and conduct electricity well Non metals do not Metaliods display both properties Nobel gases are the right most column. They are pretty non reactive because their electron shells are full Haogens are the column next to the nobel gases, they are extremely reactive because they are only one electron away from being stable.

Question:1. Luster = 2. Tightly held in Valence electrons = 3. At the right side of the periodic table = 4. Semiconductors = 5. Good conductors of electricity = 6. Usually quite brittle = 7. Properties intermediate between metals and non metals = 8. A variety of colors = 9. Three to eight valence electrons = 10. Poor conductors of heat =

Answers:1. Lustre = Metal 2. Tightly held in Valence electrons = Non-Metal 3. At the right side of the periodic table = Non-Metals 4. Semiconductors = Metalloids 5. Good conductors of electricity = Metals 6. Usually quite brittle = Metalloids 7. Properties intermediate between metals and non metals = Metalloids 8. A variety of colors = Metals 9. Three to eight valence electrons = I don't get it. 10. Poor conductors of heat = Non - Metals

Question:I'm doing a project on metals, metalloids, and nonmetals. I need to find a good website that gives good information about them but it just can't be about their properties. Thanx for your help =) Also my teacher said we can't use wikipedia.

Answers:Metals: All solids except mercury, shiny lustre, good conductors of heat and electricity, malleable, ductile Non - metals: some gasses, some solids, only bromine is a liquid, Not very shiny, poor conductors of heat and electricity, brittle, not ductile. Metalloids: Solids, can be shiny or dull, may conduct electricity, poor conductors of heat, brittle, not ductile. In the periodic table, the metals are on the left, the non-metals are on the right, and the metalloids are like the transitional "bridge" between them. I do not have more information about this, but usually, if you visit, wikipedia, there are external links on the bottom of the page which are related to the subject. Good luck on your project!

Question:When an element with 115 protons in its nucleus is synthesized, will it be a metal, nonmetal, or metalloid? EXPLAIN PLEASE!

Answers:Element 115 would be at the bottom of Group 15 (5A in the old system). The top of this group are non-metals. The center of this group are metalloid and the bottom elements are metals. That would make #115 a metal. But it is so close to the borderline with metalloids, that it is not a slam dunk answer. It will have to be tested, assuming it has a half life of more than a few microseconds.

From Youtube

Metals Non Metals And Metallurgy :Check us out at www.tutorvista.com A metal is a chemical element that is a good conductor of both electricity and heat and forms cations and ionic bonds with non-metals. In chemistry, a metal ( from Greek " " - m tallon, "mine") is an element, compound, or alloy characterized by high electrical conductivity. In a metal, atoms readily lose electrons to form positive ions (cations). Those ions are surrounded by delocalized electrons, which are responsible for the conductivity. The solid thus produced is held by electrostatic interactions between the ions and the electron cloud, which are called metallic bonds Non-metal, is a term used in chemistry when classifying the chemical elements. On the basis of their general physical and chemical properties, every element in the periodic table can be termed either a metal or a nonmetal. (A few elements with intermediate properties are referred to as metalloids). Metallurgy is a domain of materials science that studies the physical and chemical behavior of metallic elements, their intermetallic compounds, and their mixtures, which are called alloys. It is also the technology of metals: the way in which science is applied to their practical use. Metallurgy is commonly used in the craft of metalworking

Metals, Nonmetals and Metalloids :Learn about metals, nonmetals and metalloids