Abstract
The log of the force constants of the ground electronic states of all available diatomic hydrides is plotted versus the log of the atomic number of the element to which the hydrogens are bonded. A definite periodicity associated with the periods in the periodic table results. This periodicity is used to predict the force constants of ten diatomic hydrides which have as yet not been investigated. A plot of hydride interatomic distance versus the atomic number of the ``united atom'' shows a similar periodicity and strong shell structure and allows the prediction of 13 new interatomic distances for hydrides. These data are interpreted as evidence for the ``united atom'' model for hydrides. Finally plots of the low lying atomic energy states for atoms suggest that the seemingly inconsistent d shell periodicity may be the result of the mixing of energy states and hence a different type of hybridization trend in the d shell.
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