Chemical Concepts and Quantum Chemistry
Chemical concepts such as molecular orbitals, chemical bonding or aromaticity have an important role in chemical explanations although they are not observables in a strict quantum mechanical sense. Nevertheless, there are - often various - quantum chemical methods which allow to quantify them. However, they are mostly not unique, disagree quantitatively and are not straightforward to interpret. But how can their seemingly successful application be understood if these are only fictitious quantities?
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