The chemical ‘Knight’s Move’ relationship: what is its significance?
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Similarities in properties among pairs of metallic elements and their compounds in the lower-right quadrant of the Periodic Table have been named the ‘Knight’s Move’ relationship. Here, we have undertaken a systematic study of the only two ‘double-pairs’ of ‘Knight’s Move’ elements within this region: copper-indium/indium-bismuth and zinc-tin/tin-polonium, focussing on: metal melting points; formulas and properties of compounds; and melting points of halides and chalcogenides. On the basis of these comparisons, we conclude that the systematic evidence for ‘Knight’s Move’ relationships derives from similarities in formulas and properties of matching pairs of compounds in the same oxidation state. Physical properties, such as melting points, do not provide consistent patterns and trends and hence should not be considered as a common characteristic of this relationship.
KeywordsPeriodic table Periodic patterns Knight's move Copper Indium Bismuth Zinc Tin Polonium Chemical formulas Melting points
- Bailar, J.C. et al. (eds.): Comprehensive Inorganic Chemistry. Oxford, Pergamon Press (1973)Google Scholar
- Brasted, R.C.: Comprehensive inorganic chemistry, vol. 8, p. 250. New York, Van Nostrand (1961)Google Scholar
- Cotton, F.A, Wilkinson, G, Murillo, CA., Bochmann, M.: Advanced inorganic chemistry, 6th edn. New York, Wiley-Interscience (1999)Google Scholar
- Greenwood, N.N, Earnshaw, A.: Chemistry of the elements, 2nd edn. Oxford, Butterworth-Heinemann, (1997)Google Scholar
- Laing, M.: The Knight’s Move in the periodic table. Educ. Chem. 36, 160 (1999)Google Scholar
- Massey, A.G.: Main group chemistry, 2nd edn. Chichester, John Wiley (2000)Google Scholar
- Rayner-Canham, G.W., Overton, T.L.: Descriptive inorganic chemistry, 4th edn. New York, W. H. Freeman Publishing Co (2006)Google Scholar
- Rouvray, D.H. King, R.B.: (eds.) The Periodic table: into the 21st Century, vol. 135–136, pp. 177–179. Hertfordshire, England, Research Studies Press Ltd. (2004)Google Scholar
- Scerri, E.R.: The periodic table: its story and its significance, pp. 272–275. Oxford University Press, New York (2007)Google Scholar
- Winter, M, Web Elements, www.webelements.com, University of Sheffield (accessed 23 June 2006)Google Scholar