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These interesting ideas about students’ learning chemistry on triple level can further develop the ways of thinking about how students learn chemistry.
Nevertheless, these concepts, of ionic valency, covalency, etc., have been found to be so useful as to justify our considering them as constituting the modern theory of valency.
Thus the Walsh-Dray method promises the most accurate determination of small valency shifts.
High selectivity for cations of lower valency at low pH also suggests a site isolation effect.
The molecular orbital valency values are shown to be a good measure of the bonding nature of the molecular orbital.
Studies of systems like Eu1−xLaxRh2, EuA2−xBx, EuA5−xBx reveal strong local environment dependence of the intermediate valency.

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