Francais | English | Espanõl

From Wikipedia, the free encyclopedia

Together with the metals and nonmetals, the metalloids (in Greek metallon = metal and eidos = sort) form one of the three categories of chemical elements as classified by ionization and bonding properties. They have chemical properties intermediate between those of metals and nonmetals. For example, their oxides are often amphoteric. Their electronic properties vary from those of semiconductors (B,Si,Ge) to semimetals (eg. Sb). The concepts metalloid, semiconductor and semimetal should not be confused. Metalloid refers to the chemical properties of certain elements in relation to the periodic table. Semiconductor and semimetal refer to the physical properties of materials (including alloys, compounds) and there is only partial overlap between the two.

The known metalloids (and their atomic symbols) are:<ref name="acs">ACS Periodic Table. [1]</ref>

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

In the periodic table, metalloids occur along the diagonal line from boron to astatine. Elements to the upper right of this line are nonmetals; elements to the lower left are metals. This line, which separates the metals from the nonmetals is commonly known as the "stair-step" or "staircase."

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

[edit] Reference

<references/>

Periodic tables
Standard table | Vertical table | Table with names | Names and atomic masses (large) | Names and atomic masses (small) | Names and atomic masses (text only) | Inline F-block | Elements to 218 | Electron configurations | Metals and nonmetals | Table by blocks | Alternatives
Lists of elements
Name | Atomic symbol | Atomic number | Boiling point | Melting point | Density | Atomic mass
Groups:   1 -  2 -  3 -  4 -  5 -  6 -  7 -  8 -  9 - 10 - 11 - 12 - 13 - 14 - 15 - 16 - 17 - 18
Periods:  1  -  2  -  3  -  4  -  5  -  6  -  7  -  8  -  9
Series:   Alkalis  -  Alkaline earths  -  Lanthanides  -  Actinides  -  Transition metals  -  Poor metals  -  Metalloids  -  Nonmetals  -  Halogens  -  Noble gases
Blocks:  s-block  -  p-block  -  d-block  -  f-block  -  g-block

ca:Plantilla:Elements químics
ar:شبه فلز ast:Metaloide bs:Polumetali ca:Metal·loide cs:Polokov de:Halbmetall et:Poolmetallid el:Μεταλλοειδή es:Metaloide eo:Metaloido fr:Métalloïde ko:준금속 hr:Polumetali id:Metaloid is:Málmungur it:Semimetalli he:מתכות למחצה lt:Pusmetaliai lmo:Mèzz-metàj nl:Metalloïde ja:半金属 nn:Halvmetall nds:Halfmetall pl:Półmetale pt:Metalóide ro:Metaloid ru:Полуметаллы simple:Metalloid sl:Polkovina sr:Металоиди sh:Metaloid fi:Puolimetalli sv:Halvmetall th:ธาตุกึ่งโลหะ