Metalloid is a term used in chemistry when classifying the chemical elements. Chemistry (from Egyptian kēme (chem meaning "earth") is the Science concerned with the composition structure and properties A chemical element is a type of Atom that is distinguished by its Atomic number; that is by the number of Protons in its nucleus. 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. The periodic table of the chemical elements is a tabular method of displaying the Chemical elements Although precursors to this table exist its invention is The M acro E xpansion T emplate A ttribute L anguage complements TAL, providing macros which allow the reuse of code across Nonmetal 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 A few elements with intermediate properties are, however, referred to as metalloids. (In Greek metallon = metal and eidos = sort)

There is no rigorous definition of the term, but the following properties are usually considered characteristic of metalloids:

• metalloids often form amphoteric oxides. Greek (el ελληνική γλώσσα or simply el ελληνικά — "Hellenic" is an Indo-European language, spoken today by 15-22 million people mainly An oxide is a Chemical compound containing at least one Oxygen atom as well as at least one other element
• metalloids often behave as semiconductors (B,Si,Ge) to semimetals (eg. A semiconductor' is a Solid material that has Electrical conductivity in between a conductor and an insulator; it can vary over that A semimetal is a material with a small overlap in the energy of the conduction band and Valence bands However the bottom of the conduction band is 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:^[1]

• Boron (B)
• Silicon (Si)
• Germanium (Ge)
• Arsenic (As)
• Antimony (Sb)
• Tellurium (Te)

Some allotropes of elements exhibit more pronounced metal, metalloid or non-metal behavior than others. Boron (ˈbɔərɒn is a Chemical element with Atomic number 5 and the chemical symbol B. Silicon (ˈsɪlɪkən or /ˈsɪlɪkɒn/ silicium is the Chemical element that has the symbol Si and Atomic number 14 Germanium (dʒɚˈmeɪniəm is a Chemical element with the symbol Ge and Atomic number 32 Arsenic (ˈɑrsənɪk is a Chemical element that has the symbol As and Atomic number of 33 Antimony (IPA (Received Pronunciation, /ˈæntɪmoʊni/ (US is a Chemical element with the symbol Sb (stibium meaning "mark" and Tellurium (tɪˈlʊəriəm/ /tɛl- is a Chemical element that has the symbol Te and Atomic number 52 Allotropy (Gr allos, other and tropos, manner is a behavior exhibited by certain Chemical elements these elements can exist in two or more different 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. Carbon (kɑɹbən is a Chemical element with the symbol C and its Atomic number is 6 In Mineralogy, diamond is the allotrope of carbon where the carbon atoms are arranged in The Mineral graphite, as with Diamond and Fullerene, is one of the Allotropes of carbon. Phosphorus, tin, selenium and bismuth also have allotropes that display borderline behavior. Phosphorus, (ˈfɒsfərəs is the Chemical element that has the symbol P and Atomic number 15 Tin is a Chemical element with the symbol Sn (stannum and Atomic number 50 Selenium (səˈliniəm is a Chemical element with the Atomic number 34 represented by the chemical symbol Se, an atomic mass of 78 Bismuth (ˈbɪzməθ is a Chemical element that has the symbol Bi and Atomic number 83

In the standard layout of the periodic table, metalloids occur along the diagonal line through the p block from boron to astatine. The periodic table of the chemical elements is a tabular method of displaying the Chemical elements Although precursors to this table exist its invention is See also Electron configuration 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. Nonmetal 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

13	14	15	16	17
B Boron	C Carbon	N Nitrogen	O Oxygen	F Fluorine
Al Aluminium	Si Silicon	P Phosphorus	S Sulfur	Cl Chlorine
Ga Gallium	Ge Germanium	As Arsenic	Se Selenium	Br Bromine
In Indium	Sn Tin	Sb Antimony	Te Tellurium	I Iodine
Tl Thallium	Pb Lead	Bi Bismuth	Po Polonium	At Astatine

References

1. ^ ACS Periodic Table. History Carbon, Tin, and Lead, are a few of the elements well known in the ancient world - together with Sulfur, Iron, See also Gold chalcogenides Periodic table Abundance Owing to their high Reactivity, the halogens are found in the environment only in compounds or as Ions Halide ions and oxoanions [1]

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