Template:Periodic table (metalloid border)
|Distribution of elements
sometimes classified as metalloids
|Periodic table groups 1, 2, and 12 through 18:
Periodic table extract showing groups 1–2 and 12–18, and a dividing line between metals and nonmetals passing between H-Li, Be-B, B-Al, Al-Si, Si-Ge, Ge-As, As-Sb, Sb-Te, Te-Po, Po-At, At-Uus and Uus-Uuo. Elements with grey shading (B, C, Al, Si, Ge, As, Se, Sb, Te, Po, At) appear commonly to rarely in the list of metalloid lists. Elements with light tan shading (H, Be, P, S, Ga, Sn, I, Pb, Bi, Fl, Uup, Lv, Uus) appear still less frequently. Elements with pale blue shading (N, Zn, Rn) are outliers that 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).
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