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Dividing line between metals and nonmetals

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Title: Dividing line between metals and nonmetals  
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Dividing line between metals and nonmetals

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
Condensed periodic table showing a typical metal–nonmetal dividing line.
  Elements commonly recognised as metalloids (boron, silicon, germanium, arsenic, antimony and tellurium) and those inconsistently recognised as such (polonium and astatine)
  Metal-nonmetal dividing line (arbitrary): between Li and H, Be and B, Al and Si, Ge and As, Sb and Te, Po and At, Uus and Uuo

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.[1]

Contents

  • Names 1
  • History 2
  • Double line variant 3
  • Concerns 4
  • Notes 5
  • Citations 6
  • References 7

Names

This line has been called the amphoteric line,[2] the metal-nonmetal line,[3] the metalloid line,[4][5] the semimetal line,[6] or the staircase.[2][n 1] In addition, it is also erroneously referred to as the Zintl border[8] or the Zintl line.[9][10] 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.[11] 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.[12]

History

References to a dividing line between metals and nonmetals appear in the literature as far back as at least 1869.[13] In 1891, Walker published a periodic 'tabulation' with a diagonal straight line drawn between the metals and the nonmetals.[14] In 1906,

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  • De Graef M & McHenry ME 2007, Structure of materials: an introduction to crystallography, diffraction and symmetry, Cambridge University Press, Cambridge, ISBN 0-521-65151-4
  • Deming HG 1923, General chemistry: An elementary survey, John Wiley & Sons, New York
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  • Fluck E 1988, 'New notations in the period table', Pure & Applied Chemistry, vol. 60, no. 3, pp. 431–436
  • Glinka N 1959, General chemistry, Foreign Languages Publishing House, Moscow
  • Hawkes SJ 2001, 'Semimetallicity', Journal of Chemical Education, vol. 78, no. 12, pp. 1686–87, doi:10.1021/ed078p1686
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  • Hinrichs GD 1869, 'On the classification and the atomic weights of the so-called chemical elements, with particular reference to Stas's determinations', Proceedings of the American Association for the Advancement of Science, vol. 18, pp. 112–124
  • Horvath 1973, 'Critical temperature of elements and the periodic system', Journal of Chemical Education, vol. 50, no. 5, pp. 335–336, doi:10.1021/ed050p335
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  • Kniep R 1996, 'Eduard Zintl: His life and scholarly work', in SM Kauzlarich (ed.), Chemistry, structure and bonding of Zintl phases and ions, VCH, New York, pp. xvii–xxx, ISBN 1-56081-900-6
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  • Walker J 1891, 'On the periodic tabulation of the elements', The Chemical News, vol. LXIII, no. 1644, May 29, pp. 251–253
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References

  1. ^ Horvath 1973, p. 336
  2. ^ a b Levy 2001, p. 158
  3. ^ Tarendash 2001, p. 78
  4. ^ Thompson 1999
  5. ^ DiSalvo 2000, p. 1800
  6. ^ Whitley 2009
  7. ^ Sacks 2001, pp. 191, 194
  8. ^ King 2005, p. 6006
  9. ^ Herchenroeder & Gschneidner 1988
  10. ^ De Graef & McHenry 2007, p. 34
  11. ^ Kniep 1996, p. xix
  12. ^ Nordell & Miller 1999, p. 579
  13. ^ Hinrichs 1869, p. 115. In his article Walker 1891, p. 252 ^
  14. ^ Miles & Gould 1976, p. 444: 'His "Introduction to General Inorganic Chemistry," 1906, was one of the most important textbooks in the field during the first quarter of the twentieth century.'
  15. ^ Smith 1906, pp. 408, 410
  16. ^ Deming 1923, pp. 160, 165
  17. ^ Abraham, Coshow & Fix, W 1994, p. 3
  18. ^ Emsley 1985, p. 36
  19. ^ Fluck 1988, p. 432
  20. ^ Brown & Holme 2006, p. 57
  21. ^ Swenson 2005
  22. ^ Mendeléeff 1897, p. 23
  23. ^ Glinka 1959, p. 77
  24. ^ Mendeléeff 1897, p. 274
  25. ^ MacKay & MacKay 1989, p. 24
  26. ^ Norman 1997, p. 31
  27. ^ Whitten, Davis & Peck 2003, p. 1140
  28. ^ Roher 2001, pp. 4–6
  29. ^ Hawkes 2001, p. 1686
  30. ^ Kotz, Treichel & Weaver 2005, pp. 79–80
  31. ^ Housecroft & Constable 2006, p. 322
  32. ^ Deming 1923, p. 381

Citations

  1. ^ Sacks[7] described the dividing line as, 'A jagged line, like Hadrian's Wall ... [separating] the metals from the rest, with a few "semimetals," metalloids—arsenic, selenium—straddling the wall.'
  2. ^ In the context of Mendeleev's observation, Glinka[24] adds that: 'In classing an element as a metal or a nonmetal we only indicate which of its properties—metallic or nonmetallic—are more pronounced in it'.
  3. ^ Mendeleev regarded tellurium as such an intermediate substance: '... it is a bad conductor of heat and electricity, and in this respect, as in many others, it forms a transition from the metals to the nonmetals.'[25]

Notes

Mendeleev wrote that, 'It is ... impossible to draw a strict line of demarcation between metals and nonmetals, there being many intermediate substances'.[23][n 2][n 3] Several other sources note confusion or ambiguity as to the location of the dividing line;[26][27] suggest its apparent arbitrariness[28] provides grounds for refuting its validity;[29] and comment as to its misleading, contentious or approximate nature.[30][31][32] Deming himself noted that the line could not be drawn very accurately.[33]

Concerns

A dividing line between metals and nonmetals is sometimes replaced by two dividing lines. One line separates metals and metalloids; the other metalloids and nonmetals.[21][22]

Double line variant

[20][19][18] Each one had a regular stepped line separating metals from nonmetals. Merck and Company prepared a handout form of Deming's 18-column table, in 1928, which was widely circulated in American schools. By the 1930s Deming's table was appearing in handbooks and encyclopaedias of chemistry. It was also distributed for many years by the Sargent-Welch Scientific Company.[17] In 1923, Horace G. Deming, an American chemist, published short (Mendeleev style) and medium (18-column) form periodic tables.[16]

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