Properties of metals, metalloids and nonmetals

Properties

Metals

Main article: Metal

Elemental metals appear lustrous (beneath any patina); form compounds (alloys) when combined with other elements; tend to lose or share electrons when they react with other substances; and each forms at least one predominantly basic oxide.

Most metals are silvery looking, high density metals which can be plastically deformed solids with good electrical and thermal conductivity, closely packed structures, low ionisation energies and electronegativities, and are found naturally in combined states.

Some metals appear coloured (Cu, Cs, Au), have low densities (e.g. Be, Al) or very high melting points (e.g. W, Nb), are liquids at or near room temperature (e.g. Hg, Ga), are brittle (e.g. Os, Bi), not easily machined (e.g. Ti, Re), or are noble (hard to oxidise, e.g. Au, Pt), or have nonmetallic structures (Mn and Ga are structurally analogous to, respectively, white P and I).

Metals comprise the large majority of the elements, and can be subdivided into several different categories. From left to right in the periodic table, these categories include the highly reactive alkali metals; the less-reactive alkaline earth metals, lanthanides, and radioactive actinides; the archetypal transition metals; and the physically and chemically weak post-transition metals. Specialized subcategories such as the refractory metals and the noble metals also exist.

Metalloids

Main article: Metalloid

Metalloids are metallic-looking often brittle solids; tend to share electrons when they react with other substances; have weakly acidic or amphoteric oxides; and are usually found naturally in combined states.

Most are semiconductors or semimetals, moderate thermal conductors, and have structures that are more open than those of most metals.

Some metalloids (As, Sb) conduct electricity like metals.

The metalloids, as the smallest major category of elements, are not subdivided further.

Nonmetals

Main article: Nonmetal (chemistry)

Nonmetallic elements often have open structures; tend to gain or share electrons when they react with other substances; and do not form distinctly basic oxides.

Many are gases at room temperature; have relatively low densities; are poor electrical and thermal conductors; have relatively high ionisation energies and electronegativities; form acidic oxides; and are found naturally in uncombined states in large amounts.

Some nonmetals (black P, S, and Se) are brittle solids at room temperature (although each of these also have malleable, pliable or ductile allotropes).

From left to right in the periodic table, the nonmetals can be divided into the reactive nonmetals and the noble gases. The reactive nonmetals near the metalloids show some incipient metallic character, such as the metallic appearance of graphite, black phosphorus, selenium and iodine. The noble gases are almost completely inert.

Comparison of properties

Notes

Citations

References

• Addison WE 1964, The allotropy of the elements, Oldbourne Press, London
• Adler D 1969, 'Half-way elements: The technology of metalloids', book review, Technology Review, vol. 72, no. 1, Oct/Nov, pp. 18–19
• Antia, Meher. 1998, 'Focus: Levitating Liquid Boron', American Physical Society, viewed 14 December 2014
• Askeland DR, Fulay PP & Wright JW 2011, The science and engineering of materials, 6th ed., Cengage Learning, Stamford, CT,
• Atkins P, Overton T, Rourke J, Weller M & Armstrong F 2006, Shriver & Atkins' inorganic chemistry, 4th ed., Oxford University Press, Oxford,
• Austen K 2012, 'A factory for elements that barely exist', NewScientist, 21 Apr, p. 12, ISSN 1032-1233
• Bagnall KW 1966, The chemistry of selenium, tellurium and polonium, Elsevier, Amsterdam
• Bailar JC, Moeller T, Kleinberg J, Guss CO, Castellion ME & Metz C 1989, Chemistry, 3rd ed., Harcourt Brace Jovanovich, San Diego,
• Bassett LG, Bunce SC, Carter AE, Clark HM & Hollinger HB 1966, Principles of chemistry, Prentice-Hall, Englewood Cliffs, NJ
• Batsanov SS & Batsanov AS 2012, Introduction to structural chemistry, Springer Science+Business Media, Dordrecht,
• Berei K & Vasáros L 1985, 'Astatine compounds', in Kugler & Keller
• Beveridge TJ, Hughes MN, Lee H, Leung KT, Poole RK, Savvaidis I, Silver S & Trevors JT 1997, 'Metal–microbe interactions: Contemporary approaches', in RK Poole (ed.), Advances in microbial physiology, vol. 38, Academic Press, San Diego, pp. 177–243,
• Bogoroditskii NP & Pasynkov VV 1967, Radio and electronic materials, Iliffe Books, London
• Booth VH & Bloom ML 1972, Physical science: a study of matter and energy, Macmillan, New York
• Born M & Wolf E 1999, Principles of optics: Electromagnetic theory of propagation, interference and diffraction of light, 7th ed., Cambridge University Press, Cambridge,
• Brasted RC 1974, 'Oxygen group elements and their compounds', in The new Encyclopædia Britannica, vol. 13, Encyclopædia Britannica, Chicago, pp. 809–824
• Brescia F, Arents J, Meislich H & Turk A 1975, Fundamentals of chemistry, 3rd ed., Academic Press, New York, p. 453,
• Brinkley SR 1945, Introductory general chemistry, 3rd ed., Macmillan, New York
• Burakowski T & Wierzchoń T 1999, Surface engineering of metals: Principles, equipment, technologies, CRC Press, Boca Raton, Fla,
• Carapella SC 1968a, 'Arsenic' in CA Hampel (ed.), The encyclopedia of the chemical elements, Reinhold, New York, pp. 29–32
• Chang R 1994, Chemistry, 5th (international) ed., McGraw-Hill, New York
• Chang R 2002, Chemistry, 7th ed., McGraw Hill, Boston
• Chedd G 1969, Half-way elements: The technology of metalloids, Doubleday, New York
• Chizhikov DM & Shchastlivyi VP 1968, Selenium and selenides, translated from the Russian by EM Elkin, Collet's, London
• Choppin GR & Johnsen RH 1972, Introductory chemistry, Addison-Wesley, Reading, Massachusetts
• Christensen RM 2012, 'Are the elements ductile or brittle: A nanoscale evaluation', in Failure theory for materials science and engineering, chapter 12, p. 14
• Cordes EH & Scaheffer R 1973, Chemistry, Harper & Row, New York
• Cotton SA 1994, 'Scandium, yttrium & the lanthanides: Inorganic & coordination chemistry', in RB King (ed.), Encyclopedia of inorganic chemistry, 2nd ed., vol. 7, John Wiley & Sons, New York, pp. 3595–3616,
• Cox PA 2004, Inorganic chemistry, 2nd ed., Instant notes series, Bios Scientific, London,
• Cverna F 2002, ASM ready reference: Thermal properties of metals, ASM International, Materials Park, Ohio,
• Donohoe J 1982, The Structures of the Elements, Robert E. Krieger, Malabar, Florida,
• Dunstan S 1968, Principles of chemistry, D. Van Nostrand Company, London
• Eby GS, Waugh CL, Welch HE & Buckingham BH 1943, The physical sciences, Ginn and Company, Boston
• Edwards PP 2000, 'What, why and when is a metal?', in N Hall (ed.), The new chemistry, Cambridge University, Cambridge, pp. 85–114
• Emsley J 2001, Nature's building blocks: An A–Z guide to the elements,
• Georgievskii VI 1982, 'Biochemical regions. Mineral composition of feeds', in VI Georgievskii, BN Annenkov & VT Samokhin (eds), Mineral nutrition of animals: Studies in the agricultural and food sciences, Butterworths, London, pp. 57–68,
• Gillespie RJ & Robinson EA 1959, 'The sulphuric acid solvent system', in HJ Emeléus & AG Sharpe (eds), Advances in inorganic chemistry and radiochemistry, vol. 1, Academic Press, New York, pp. 386–424
• Glazov VM, Chizhevskaya SN & Glagoleva NN 1969, Liquid semiconductors, Plenum, New York
• Glinka N 1965, General chemistry, trans. D Sobolev, Gordon & Breach, New York
• Greenwood NN & Earnshaw A 2002, Chemistry of the elements, 2nd ed., Butterworth-Heinemann,
• Gupta A, Awana VPS, Samanta SB, Kishan H & Narlikar AV 2005, 'Disordered superconductors' in AV Narlikar (ed.), Frontiers in superconducting materials, Springer-Verlag, Berlin, p. 502,
• Habashi F 2003, Metals from ores: an introduction to extractive metallurgy, Métallurgie Extractive Québec, Sainte Foy, Québec,
• Manson SS & Halford GR 2006, Fatigue and Durability of Structural Materials, ASM International, Materials Park, OH,
• Hem JD 1985, Study and interpretation of the chemical characteristics of natural water, paper 2254, 3rd ed., US Geological Society, Alexandria, Virginia
• Heslop RB & Robinson PL 1963, Inorganic chemistry: A guide to advanced study, Elsevier, Amsterdam
• Hill G & Holman J 2000, Chemistry in context, 5th ed., Nelson Thornes, Cheltenham,
• Hiller LA & Herber RH 1960, Principles of chemistry, McGraw-Hill, New York
• Holtzclaw HF, Robinson WR & Odom JD 1991, General chemistry, 9th ed., DC Heath, Lexington,
• Huheey JE, Keiter EA & Keiter RL 1993, Principles of Structure & Reactivity, 4th ed., HarperCollins College Publishers,
• Hultgren HH 1966, 'Metalloids', in GL Clark & GG Hawley (eds), The encyclopedia of inorganic chemistry, 2nd ed., Reinhold Publishing, New York
• Hunt A 2000, The complete A-Z chemistry handbook, 2nd ed., Hodder & Stoughton, London
• Iler RK 1979, The chemistry of silica: solubility, polymerization, colloid and surface properties, and biochemistry, John Wiley, New York,
• Jauncey GEM 1948, Modern physics: A second course in college physics, D. Von Nostrand, New York
• Jenkins GM & Kawamura K 1976, Polymeric carbons—carbon fibre, glass and char, Cambridge University Press, Cambridge
• Keenan CW, Kleinfelter DC & Wood JH 1980, General college chemistry, 6th ed., Harper & Row, San Francisco,
• Keogh DW 2005, 'Actinides: Inorganic & coordination chemistry', in RB King (ed.), Encyclopedia of inorganic chemistry, 2nd ed., vol. 1, John Wiley & Sons, New York, pp. 2–32,
• Klein CA & Cardinale GF 1992, 'Young's modulus and Poisson's ratio of CVD diamond', in A Feldman & S Holly, SPIE Proceedings, vol. 1759, Diamond Optics V, pp. 178‒192,
• Kneen WR, Rogers MJW & Simpson P 1972, Chemistry: Facts, patterns, and principles, Addison-Wesley, London
• Kozyrev PT 1959, 'Deoxidized selenium and the dependence of its electrical conductivity on pressure. II', Physics of the solid state, translation of the journal Solid State Physics (Fizika tverdogo tela) of the Academy of Sciences of the USSR, vol. 1, pp. 102–110
• Lagrenaudie J 1953, 'Semiconductive properties of boron' (in French), Journal de chimie physique, vol. 50, nos. 11–12, Nov-Dec, pp. 629–633
• Leith MM 1966, Velocity of sound in solid iodine, MSc thesis, University of British Columbia. Leith comments that, '... as iodine is anisotropic in many of its physical properties most attention was paid to two amorphous samples which were thought to give representative average values of the properties of iodine' (p. iii).
• Lide DR & Frederikse HPR (eds) 1998, CRC Handbook of chemistry and physics, 79th ed., CRC Press, Boca Raton, Florida,
• Lidin RA 1996, Inorganic substances handbook, Begell House, New York,
• Marlowe MO 1970, Elastic properties of three grades of fine grained graphite to 2000 °C, NASA CR‒66933, National Aeronautics and Space Administration, Scientific and Technical Information Facility, College Park, Maryland
• Martienssen W & Warlimont H (eds) 2005, Springer Handbook of Condensed Matter and Materials Data, Springer, Heidelberg,
• McQuarrie DA & Rock PA 1987, General chemistry, 3rd ed., WH Freeman, New York
• Mendeléeff DI 1897, The Principles of Chemistry, vol. 2, 5th ed., trans. G Kamensky, AJ Greenaway (ed.), Longmans, Green & Co., London
• Metcalfe HC, Williams JE & Castka JF 1966, Modern chemistry, 3rd ed., Holt, Rinehart and Winston, New York
• Mott NF & Davis EA 2012, 'Electronic Processes in Non-Crystalline Materials', 2nd ed., Oxford University Press, Oxford,
• Nemodruk AA & Karalova ZK 1969, Analytical chemistry of boron, R Kondor trans., Ann Arbor Humphrey Science, Ann Arbor, Michigan
• New Scientist 1975, 'Chemistry on the islands of stability', 11 Sep, p. 574, ISSN 1032-1233
• Orton JW 2004, The story of semiconductors, Oxford University, Oxford,
• Parish RV 1977, The metallic elements, Longman, London
• Partington JR 1944, A text-book of inorganic chemistry, 5th ed., Macmillan & Co., London
• Pauling L 1988, General chemistry, Dover Publications, NY,
• Perkins D 1998, Mineralogy, Prentice Hall Books, Upper Saddle River, New Jersey,
• Pottenger FM & Bowes EE 1976, Fundamentals of chemistry, Scott, Foresman and Co., Glenview, Illinois
• Rao KY 2002, Structural chemistry of glasses, Elsevier, Oxford,
• Raub CJ & Griffith WP 1980, 'Osmium and sulphur', in Gmelin handbook of inorganic chemistry, 8th ed., 'Os, Osmium: Supplement', K Swars (ed.), system no. 66, Springer-Verlag, Berlin, pp. 166–170,
• Reynolds WN 1969, Physical properties of graphite, Elsevier, Amsterdam
• Rochow EG 1966, The metalloids, DC Heath and Company, Boston
• Russell JB 1981, General chemistry, McGraw-Hill, Auckland
• Russell AM & Lee KL 2005, Structure-property relations in nonferrous metals, Wiley-Interscience, New York,
• Sanderson RT 1960, Chemical periodicity, Reinhold Publishing, New York
• Sanderson RT 1967, Inorganic chemistry, Reinhold, New York
• Sanderson K 2012, 'Stinky rocks hide Earth's only haven for natural fluorine', Nature News, July,
• Schaefer JC 1968, 'Boron' in CA Hampel (ed.), The encyclopedia of the chemical elements, Reinhold, New York, pp. 73–81
• Sidgwick NV 1950, The chemical elements and their compounds, vol. 1, Clarendon, Oxford
• Sisler HH 1973, Electronic structure, properties, and the periodic law, Van Nostrand, New York
• Slyh JA 1955, 'Graphite', in JF Hogerton & RC Grass (eds), Reactor handbook: Materials, US Atomic Energy Commission, McGraw Hill, New York, pp. 133‒154
• Smith A 1921, General chemistry for colleges, 2nd ed., Century, New York
• Sneed MC 1954, General college chemistry, Van Nostrand, New York
• Soverna S 2004, 'Indication for a gaseous element 112', in U Grundinger (ed.), GSI Scientific Report 2003, GSI Report 2004-1, p. 187, ISSN 0174-0814
• Stoker HS 2010, General, organic, and biological chemistry, 5th ed., Brooks/Cole, Cengage Learning, Belmont CA,
• Sundara Rao RVG 1954, 'Erratum to: Elastic constants of orthorhombic sulphur', Proceedings of the Indian Academy of Sciences, Section A, vol. 40, no. 3, p. 151
• Tilley RJD 2004, Understanding solids: The science of materials, 4th ed., John Wiley, New York
• Walker JD, Newman MC & Enache M 2013, Fundamental QSARs for metal ions, CRC Press, Boca Raton,
• Wiberg N 2001, Inorganic chemistry, Academic Press, San Diego,
• Wickleder MS 2007, 'Chalcogen-oxygen chemistry', in FA Devillanova (ed.), Handbook of chalcogen chemistry: new perspectives in sulfur, selenium and tellurium, RSC, Cambridge, pp. 344–377,
• Wilson AH 1966, Thermodynamics and statistical mechanics, Cambridge University, Cambridge
• Witczak Z, Goncharova VA & Witczak PP 2000, 'Irreversible effect of hydrostatic pressure on the elastic properties of polycrystalline tellurium', in MH Manghnani, WJ Nellis & MF Nicol (eds), Science and technology of high pressure: Proceedings of the International Conference on High Pressure Science and Technology (AIRAPT-17), Honolulu, Hawaii, 25‒30 July 1999, vol. 2, Universities Press, Hyderabad, pp. 822‒825,
• Young RV & Sessine S (eds) 2000, World of chemistry, Gale Group, Farmington Hills, Michigan
• Zhigal'skii GP & Jones BK 2003, Physical properties of thin metal films, Taylor & Francis, London,
• Zuckerman & Hagen (eds) 1991, Inorganic reactions and methods, vol, 5: The formation of bonds to group VIB (O, S, Se, Te, Po) elements (part 1), VCH Publishers, Deerfield Beach, Fla,

References

1. [[#Mendeléeff1897a. Mendeléeff 1897, p. 274]]
2. [[#Kneen1972. Kneen, Rogers & Simpson, 1972, p. 263]]. Columns 2 (metals) and 4 (nonmetals) are sourced from this reference unless otherwise indicated.
3. [[#Russell2005. Russell & Lee 2005, p. 147]]
4. [[#Pottenger1976. Pottenger & Bowes 1976, p. 138]]
5. [[#Askeland. Askeland, Fulay & Wright 2011, p. 806]]
6. [[#Born. Born & Wolf 1999, p. 746]]
7. [[#Lagrenaudie. Lagrenaudie 1953]]
8. [[#Rochow1966. Rochow 1966, pp. 23, 25]]
9. [[#Burakowski. Burakowski & Wierzchoń 1999, p. 336]]
10. [[#Olechna. Olechna & Knox 1965, pp. A991‒92]]
11. [[#Stoker2010. Stoker 2010, p. 62]]
12. [[#Chang2002. Chang 2002, p. 304]]. Chang speculates that the melting point of francium would be about 23 °C.
13. [[#NewSci1975. New Scientist 1975]]; [[#Soverna2004. Soverna 2004]]; [[#Eichler2007. Eichler, Aksenov & Belozeroz et al. 2007]]; [[#Austen2012. Austen 2012]]
14. [[#Rochow1966. Rochow 1966, p. 4]]
15. [[#Hunt2000. Hunt 2000, p. 256]]
16. [[#Sisler1973. Sisler 1973, p. 89]]
17. [[#Hérold2006. Hérold 2006, pp. 149–150]]
18. [[#Russell2005. Russell & Lee 2005]]
19. [[#Legit. Legit, Friák & Šob 2010, p. 214118-18]]
20. [[#Halford. Manson & Halford 2006, pp. 378, 410]]
21. [[#McQuarrie1987. McQuarrie & Rock 1987, p. 85]]
22. [[#Chung. Chung 1987]];{{Broken footnote. (November 2025 [[#Godfrin). Godfrin & Lauter 1995]]{{Broken footnote. (November 2025)
23. [[#Cambridge. Cambridge Enterprise 2013]]{{Broken footnote. (November 2025)
24. [[#Faraday. Faraday 1853, p. 42]];{{Broken footnote. (November 2025 [[#Holderness). Holderness & Berry 1979, p. 255]]{{Broken footnote. (November 2025)
25. [[#Partington. Partington 1944, p. 405]]
26. [[#Regnault1853. Regnault 1853, p. 208]]{{Broken footnote. (November 2025)
27. [[#Christensen2012. Christensen 2012, p. 14]]
28. [[#Gschneidner1964. Gschneidner 1964, pp. 292‒93]].
29. [[#Qin2012. Qin et al. 2012, p. 258]]
30. [[#Hopcroft2010. Hopcroft, Nix & Kenny 2010, p. 236]]
31. [[#Greaves2011. Greaves et al. 2011, p. 826]]
32. [[#Brassington1980. Brassington et al. 1980]]
33. [[#Martienssen2005. Martienssen & Warlimont 2005, p. 100]]
34. [[#Witczak2000. Witczak 2000, p. 823]]
35. [[#Marlowe1970. Marlowe 1970, p. 6]];[[#Slyh1955. Slyh 1955, p. 146]]
36. [[#Klein1992. Klein & Cardinale 1992, pp. 184‒85]]
37. [[#Appalakondaiah. Appalakondaiah et al. 2012, pp. 035105‒6]]
38. [[#SundaraA. Sundara Rao 1950]]; [[#SundaraB. Sundara Rao 1954]]; [[#Ravindran1998. Ravindran 1998, pp. 4897‒98]]
39. [[#Lindegaard1966. Lindegaard & Dahle 1966, p. 264]]
40. [[#Leith. Leith 1966, pp. 38‒39]]
41. [[#Donohoe. Donohoe 1982]]; [[#Russell2005. Russell & Lee 2005]]
42. [[#Gupta2005. Gupta et al. 2005, p. 502]]
43. [[#Walker. Walker, Newman & Enache 2013, p. 25]]
44. [[#Wiberg2001. Wiberg 2001, p. 143]]
45. [[#Bbatsanov. Batsanov & Batsanov 2012, p. 275]]
46. [[#Clementi. Clementi & Raimondi 1963]]; [[#Clementi1967. Clementi, Raimondi & Reinhardt 1967]]
47. [[#Addison. Addison 1964]]; [[#Donohoe. Donohoe 1982]]
48. [[#Vernon. Vernon 2013, p. 1704]]{{Broken footnote. (November 2025)
49. [[#Parish1977. Parish 1977, pp. 34, 48, 112, 142, 156, 178]]
50. [[#Emsley2001. Emsley 2001, p. 12]]
51. [[#Russell1981. Russell 1981, p. 628]]
52. [[#Herzfeld1927. Herzfeld 1927]]; [[#Edwards2000. Edwards 2000, pp. 100–103]]
53. [[#Edwards1999. Edwards 1999, p. 416]]
54. [[#Edwards1983. Edwards & Sienko 1983, p. 695]]
55. Edwards et al. 2010]]
56. [[#Desai1984. Desai, James & Ho 1984, p. 1160]]; [[#Matula1979. Matula 1979, p. 1260]]
57. [[#Choppin1972. Choppin & Johnsen 1972, p. 351]]
58. [[#Schaefer1968. Schaefer 1968, p. 76]]; [[#Carapella1968. Carapella 1968, p. 30]]
59. [[#Glazov1969. Glazov, Chizhevskaya & Glagoleva 1969 p. 86]]
60. [[#Kozyrev1959. Kozyrev 1959, p. 104]]
61. [[#Chizhikov1968. Chizhikov & Shchastlivyi 1968, p. 25]]
62. [[#Bogoroditskii1967. Bogoroditskii & Pasynkov 1967, p. 77]]; [[#Jenkins1976. Jenkins & Kawamura 1976, p. 88]]
63. [[#Rao1986. Rao & Ganguly 1986]]
64. [[#MottDavis. Mott & Davis 2012, p. 177]]
65. [[#Edwards1983. Edwards & Sienko 1983, p. 691]]
66. [[#Antia1998. Antia 1998]]
67. [[#Cverna2002. Cverna 2002, p.1]]
68. [[#Cordes1973. Cordes & Scaheffer 1973, p. 79]]
69. [[#Hill2000. Hill & Holman 2000, p. 42]]
70. [[#Tilley2004. Tilley 2004, p. 487]]
71. [[#Russell2005. Russell & Lee 2005, p. 466]]
72. [[#Orton2004. Orton 2004, pp. 11–12]]
73. [[#Zhigal'skii2003. Zhigal'skii & Jones 2003, p. 66]]: '[[Bismuth]], [[antimony]], [[arsenic]] and [[graphite]] are considered to be semimetals ... In bulk semimetals ... the resistivity will increase with temperature ... to give a positive temperature coefficient of resistivity ...'
74. [[#Jauncey1948. Jauncey 1948, p. 500]]: 'Nonmetals mostly have negative temperature coefficients. For instance, carbon ... [has a] resistance [that] decreases with a rise in temperature. However, recent experiments on very pure graphite, which is a form of carbon, have shown that pure carbon in this form behaves similarly to metals in regard to its resistance.'
75. [[#Reynolds1969. Reynolds 1969, pp. 91–92]]
76. [[#Wilson1966. Wilson 1966, p. 260]]
77. [[#Wittenberg1972. Wittenberg 1972, p. 4526]]
78. [[#Habashi2003. Habashi 2003, p. 73]]
79. [[#Bailar1989. Bailar et al. 1989, p. 742]]
80. [[#Cox2004. Cox 2004, p. 27]]
81. [[#Hiller1960. Hiller & Herber 1960, inside front cover; p. 225]]
82. [[#Beveridge1997. Beveridge et al. 1997, p. 185]]
83. [[#Bailar1989. Bailar et al. 1989, p. 417]]
84. [[#Metcalfe1966. Metcalfe, Williams & Castka 1966, p. 72]]
85. [[#Chang1994. Chang 1994, p. 311]]
86. [[#Pauling1988. Pauling 1988, p. 183]]
87. [[#Mann2000. Mann et al. 2000, p. 2783]]
88. [[#Chedd1969. Chedd 1969, pp. 24–25]]
89. [[#Adler1969. Adler 1969, pp. 18–19]]
90. [[#Young2000. Young & Sessine 2000, p. 849]]
91. [[#Hultgren1966. Hultgren 1966, p. 648]]
92. [[#Bassett1966. Bassett et al. 1966, p. 602]]
93. [[#Rochow1966. Rochow 1966, p. 34]]
94. [[#Martienssen2005. Martienssen & Warlimont 2005, p. 257]]
95. [[#Sidorov1960. Sidorov 1960]]
96. [[#Brasted1974. Brasted 1974, p. 814]]
97. [[#Atkins2006. Atkins 2006 et al., pp. 8, 122–23]]
98. [[#Rao2002. Rao 2002, p. 22]]
99. [[#Wickleder2006. Wickleder, Pley & Büchner 2006]]; [[#Betke2011. Betke & Wickleder 2011]]
100. [[#Cotton1994. Cotton 1994, p. 3606]]
101. [[#Keogh2005. Keogh 2005, p. 16]]
102. [[#Raub1980. Raub & Griffith 1980, p. 167]]
103. [[#Nemodruk1969. Nemodruk & Karalova 1969, p. 48]]
104. [[#Sneed1954. Sneed 1954, p. 472]]; [[#Gillespie1959. Gillespie & Robinson 1959, p. 407]]
105. [[#Zuckerman1991. Zuckerman & Hagen 1991, p. 303]]
106. [[#Sanderson1967. Sanderson 1967, p. 178]]
107. [[#Iler1979. Iler 1979, p. 190]]
108. [[#Sanderson1960. Sanderson 1960, p. 162]]; [[#Greenwood2002. Greenwood & Earnshaw 2002, p. 387]]
109. [[#Mercier1982. Mercier & Douglade 1982]]
110. [[#Douglade1982. Douglade & Mercier 1982]]
111. [[#Wiberg2001. Wiberg 2001, p. 764]]
112. [[#Wickleder2007. Wickleder 2007, p. 350]]
113. [[#Bagnall1966. Bagnall 1966, pp. 140−41]]
114. [[#Berei1985. Berei & Vasáros 1985, pp. 221, 229]]
115. [[#Wiberg2001. Wiberg 2001, p. 795]]
116. [[#Lidin1996. Lidin 1996, pp. 266, 270]]; [[#Brescia1975. Brescia et al. 1975, p. 453]]
117. [[#Greenwood2002. Greenwood & Earnshaw 2002, p. 786]]
118. [[#Furuseth1974. Furuseth et al. 1974]]
119. [[#Holtzclaw1991. Holtzclaw, Robinson & Odom 1991, pp. 706–07]]; [[#Keenan1980. Keenan, Kleinfelter & Wood 1980, pp. 693–95]]
120. [[#Kneen1972. Kneen, Rogers & Simpson 1972, p. 278]]
121. [[#Heslop1963. Heslop & Robinson 1963, p. 417]]
122. [[#Rochow1966. Rochow 1966, pp. 28–29]]
123. [[#Bagnall1966. Bagnall 1966, pp. 108, 120]]; [[#Lidin1996. Lidin 1996, passim]]
124. [[#Smith1921. Smith 1921, p. 295]]; [[#Sidgwick1950. Sidgwick 1950, pp. 605, 608]]; [[#Dunstan1968. Dunstan 1968, pp. 408, 438]]
125. [[#Dunstan1968. Dunstan 1968, pp. 312, 408]]
126. [[#Georgievskii. Georgievskii 1982, p. 58]]
127. [[#Lide. Lide & Frederikse 1998, p. 14–6]]
128. [[#Hem. Hem 1985, p. 7]]
129. [[#Perkins. Perkins 1998, p. 350]]
130. [[#SandersonK. Sanderson 2012]]