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(5) Hydrogen and van der Waals bonds. In most textbooks, covalent and ionicbonds are described as ‘real’ chemical bonds, whereas hydrogen and van der Waalsbonds are often presented as ‘just forces’ (Taber, 1998). Again this distinction is fartoo rigid and misleading. While the relative strengths of different types of bonds are,of course, very important, even ‘weak’ bonds do indeed bond together differentchemical units and sub-units and can have profound chemical consequences (LevyNahum et al, 2007; Taber & Coll, 2002), e.g., hydrogen bonding in biochemistry (forexample in the double helix structure of DNA). Therefore, a continuum scale is amore appropriate scientific description. Two related over-simplifications are theclassification of hydrogen bonds as strictly inter-molecular, whereas they are oftenintra-molecular as well (in proteins for instance), and the discussion of such bondsonly when N, O, or F atoms are involved, whereas hydrogen bonds, albeit weaker ornon-conventional, may occur with other atoms or groups as well (e.g., Naaman &Vager, 1999; Nakanaga & Buchhold, 2002).
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