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We present an approach for the determination of covalent bond orders from the experimental electron density and its derivatives at the bond critical points. An application of this method to a series of organic compounds has shown that it provides a bonding quantification that is in reasonable agreement with that obtained by orbital theory. The `experimental' atomic valence indices are also defined and their significance for the characterization of chemical problems is discussed.

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Portable Document Format (PDF) file https://doi.org/10.1107/S0108768106046003/av5078sup1.pdf
Bond orders


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