Template:Periodic table (metalloid border)

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Distribution and recognition status
of elements classified as metalloids
1 2 12 13 14 15 16 17 18
H     He
Li Be B C N O F Ne
Na Mg Al Si P S Cl Ar
K Ca Zn Ga Ge As Se Br Kr
Rb Sr Cd In Sn Sb Te I Xe
Cs Ba Hg Tl Pb Bi Po At Rn
Fr Ra Cn Uut Fl Uup Lv Uus Uuo
 
  Commonly (93%) to rarely (9%) recognised as a
metalloid: B, C, Al, Si, Ge, As, Se, Sb, Te, Po, At
  Very rarely (1–5%): H, Be, P, S, Ga, Sn, I, Pb, Bi, Fl, Uup, Lv, Uus
  Sporadically: N, Zn, Rn
  Metal-nonmetal dividing line: between H and Li, Be and B, Al and Si, Ge and As, Sb and Te, Po and At, and Uus and Uuo

Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals. Percentages are median appearance frequencies in the list of metalloid lists. Sporadically recognised elements show that the metalloid net is sometimes cast very widely; although they do not appear in the list of metalloid lists, isolated references to their designation as metalloids can be found in the literature (as cited in this article).

References

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