Hydrogen Bonds

The interatomic distance of monovalent atomic contacts are significantly shorter than the value calculated as the sum of the corresponding van der Waals radii when one of the atoms is hydrogen. Because the entire electron shell of hydrogen is appreciably shifted onto the atom to which hydrogen is covalently bound, the shell repulsion between contact partners is small, and the attracting charges can approach each other more closely. Such a short distance approach gives rise to a high attractive Coulomb energy and, therefore, a high dispersion energy.

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