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Dividing line between metals and nonmetals
The dividing line between metals and nonmetals can be found, in varying configurations, on some representations of the periodic table of the elements (see mini-example, right). Elements to the lower left of the line generally display increasing metallic behaviour; elements to the upper right display increasing nonmetallic behaviour. When presented as a regular stair-step, elements with the highest critical temperature for their groups (Li, Be, Al, Ge, Sb, Po) lie just below the line.〔Horvath 1973, p. 336〕
==Names==
This line has been called the ''amphoteric line,''〔Levy 2001, p. 158〕 the ''metal-nonmetal line,''〔Tarendash 2001, p. 78〕 the ''metalloid line,''〔Thompson 1999〕〔DiSalvo 2000, p. 1800〕 the ''semimetal line,''〔Whitley 2009〕 or the ''staircase.''〔 In addition, it is also erroneously referred to as the ''Zintl border''〔King 2005, p. 6006〕 or the ''Zintl line.''〔Herchenroeder & Gschneidner 1988〕〔De Graef & McHenry 2007, p. 34〕 The last two terms instead refer to a vertical line sometimes drawn between groups 13 and 14. This particular line was christened by Laves in 1941.〔Kniep 1996, p. xix〕 It differentiates group 13 boron elements from those in and to the right of group 14 (the carbon elements). The former generally combine with electropositive metals to make intermetallic compounds whereas the latter usually form salt-like compounds.〔Nordell & Miller 1999, p. 579〕
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