Comparisons Among Different Approaches Toward Atomic Radii
Pablo R. Duchowicz and Eduardo A. Castro
CEQUINOR, Departamento de Quìmica, Facultad de Ciencias Exactas
Universidad Nacional de La Plata, Calles 47 y 115
La Plata 1900, Argentina
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ABSTRACT
Ameliorated polynomial relationships between a recently proposed set of atomic radii and other well known experimental and theoretical data are presented. These improved equations allow the discussion of several chemical bonding features in a more accurate way.
INTRODUCTION
Even before Dalton raised the issue of the atom's existence, man has tried to answer the fundamental question; which is the atom size? As Science evolved we have seen the difficulty answering this question and nowadays we have not achieved a unique and universally accepted response. From the last part of the 19th century, when there were rather good estimations of Avogadro's number, it was known the order of magnitude of atomic size. Later on, several experimental procedures were designed to obtain more accurate results. For example, the incidence of X-rays on crystals has allowed to get very good interatomic distances. However, since there exist a large number of crystalline systems, it was soon recognized that an atom size depends on the environment. . . . . .
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