Sizes of atoms - Sizes of atoms From the quantum mechanical...

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Sizes of atoms From the quantum mechanical model of atoms we can conclude that an atom does not have a sharply defined boundary. This leads to a conceptual problem - just what exactly is the "size" of an atom? It is possible to estimate the atomic radius of an atom by assuming that atoms are spherical objects that touch each other when they are bonded together in molecules The Br-Br distance in Br 2 is 2.28 Å, thus the radius of the Br atom is 1.14 Å The C-C bond distance is 1.54 Å, thus the radius of Carbon is 0.77 Å What about a C-Br bond distance? To have useful predictive values, the determined atomic radii should hold true (i.e. be additive) when considering other possible compounds Predict C-Br bond distance to be equal to 1.14 + 0.77 = 1.91 Å In many different compounds with C-Br bonds, the distance is approximately this length What are the general characteristics of atomic bond lengths as determined from bond- bond distances (small molecule crystallography, NMR, other methods) Within the
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