tends to be classified as a nonmetal. 477 found that liquid boron behaved like a metal. The most recent iupac publications on nomenclature and terminology do not include any recommendations on the usage of the terms metalloid or semimetal. 153 Activated carbon and alumina have been used as catalysts for the removal of sulfur contaminants from natural gas. The layers are stacked together and held loosely by van der Waals forces and delocalized valence electrons.
2057 Salentine 1987,. . 4, Pergamon, Oxford Bailar JC, Moeller T, Kleinberg J, Guss CO, Castellion ME Metz C 1989, Chemistry, 3rd., Harcourt Brace Jovanovich, San Diego, isbn Barfuß H, Böhnlein G, Freunek P, Hofmann R, Hohenstein H, Kreische W, Niedrig H and. 379 The otherwise acidic pentoxide Sb2O5 shows some basic (metallic) behaviour in that it can be dissolved in very acidic solutions, with the formation of the oxycation SbO. 279 Tellurium has an extensive organometallic chemistry (see Organotellurium chemistry ). 118 a b Metcalfe, Williams Castka 1974,. . It has the narrow liquid range ordinarily associated with nonmetals (mp 302 C; bp 337 C). 335 Arsenic edit Main article: Arsenic Arsenic, sealed in a container to prevent tarnishing Arsenic is a grey, metallic looking solid. 27181, doi :.1016/0039-9140(64)80036-9 Charlier J-C, Gonze X, Michenaud J-P 1994, First-principles Study of the Stacking Effect on the Electronic Properties of Graphite(s Carbon, vol. 891 Asmussen Reinhard 2002,. .
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204205, 207 Greenwood 2001,. 25 ; Henderson 2000,. . 212 Housecroft Sharpe 2008,. . 10728, in Kugler Keller Vernon RE 2013, 'Which Elements Are Metalloids? 5656, doi :.1007/BF00890855 Patel MR 2012, Introduction to Electrical Power and Power Electronics CRC Press, Boca Raton, isbn Paul RC, Puri JK, Sharma RD Malhotra KC 1971, 'Unusual Cations of Arsenic Inorganic and Nuclear Chemistry Letters, vol. 417 "The boundary between metals and metalloids is indefinite. 28 Kudryavtsev 1974,.,. . 310 Germanium also reacts with molten caustic soda to yield sodium germanate Na2GeO3 and hydrogen gas. 175 Phosphorus, selenium, and lead, which are less often recognised as metalloids, are also used in glasses. Boron and silicon are commonly encountered; 183 they act somewhat like metal fuels.
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1131 The Economist 20,. . 391 ; Schroers 2013,. . 92 Nonmetals have electrical conductivity values of from 1018 Scm1 for the elemental gases to 3 104 in graphite. Sigma bonds, spread through the layer and populated with delocalized electrons, reflected in the properties of iodine (lustre, color, moderate electrical conductivity). Reported that defect-free crystals of graphene large enough to have electronic uses could be grown on, and removed from, a germanium substrate. 430 Its crystalline structure shows some evidence of directional bonding. 2856 ; Kolobov Tominaga 2012,. . 4 German Energy Society 2008,. .