Template:Periodic table (metalloid)

Elements recognized as metalloids
v
t
e
	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 (86–99%): B, Si, Ge, As, Sb, Te Irregularly recognized (40–49%): Po, At Less commonly recognized (24%): Se Rarely recognized (8–10%): C, Al (All other elements cited in less than 6% of sources) 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.

References

^ For a related commentary see also: Vernon RE 2013, 'Which Elements Are Metalloids?', Journal of Chemical Education, vol. 90, no. 12, pp. 1703–1707, doi:10.1021/ed3008457

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