Metalloid

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Elements recognized as metalloids
  13 14 15 16 17
2 B
Boron
C
Carbon
N
Nitrogen
O
Oxygen
F
Fluorine
3 Al
Aluminium
Si
Silicon
P
Phosphorus
S
Sulfur
Cl
Chlorine
4 Ga
Gallium
Ge
Germanium
As
Arsenic
Se
Selenium
Br
Bromine
5 In
Indium
Sn
Tin
Sb
Antimony
Te
Tellurium
I
Iodine
6 Tl
Thallium
Pb
Lead
Bi
Bismuth
Po
Polonium
At
Astatine
 
  Commonly recognized (93%): B, Si, Ge, As, Sb, Te
  Irregularly recognized (44%): Po, At
  Less commonly recognized (24%): Se
  Rarely recognized (9%): C, Al
  Arbitrary metal-nonmetal dividing line: between Be and B, Al and Si, Ge and As, Sb and Te, Po and At

Recognition status, as metalloids, of some elements in the p-block of the periodic table. Percentages are median appearance frequencies in the lists of metalloids. [n 1] The staircase-shaped line is a typical example of the arbitrary metal–nonmetal dividing line found on some periodic tables.

This is a list of 194 sources that each list metalloids: elements classified as metalloids. The sources are listed in chronological order. Lists of metalloids differ since there is no rigorous definition of metalloid. Individual lists share common ground, with variations occurring at the margins. The elements most often regarded as metalloids are boron, silicon, germanium, arsenic, antimony and tellurium. Wikipedia generally categorises these six as metalloids, with the addition of astatine. Other sources may subtract from this list or add a varying number of other elements.

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