Intermolecular Interactions and the Hydrogen Bond

There are quite a few types of intermolecular forces (see Retouches section 7.R.5),f but we are going to focus here on a particular interaction, called the hydrogen bond (H-bond). The term bond is a misnomer, because this is not the click chemical bond that holds the atoms in a molecule. This is a much weaker interaction that arises when a positively charged H(5 ) in one molecule approaches the negatively charged X(5 ) of another molecule, where X is one of the three most electronegative atoms, namely N, O, or F 

FIGURE 7.12 Hydrogen bonds (H-bonds) drawn as dotted lines (a) in HF, (b) in H2O, and (c) between H2O and NH3. Note the H-bonds are not click bonds but rather are relatively 

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