Exact(5)
Their validity should be tested by checking that the valence sum rule is also is obeyed around the anions, but such checks, if performed, are rarely reported.
In the bond valence model all the electrostatic effects are incorporated into the bonds themselves and the adhesion between solid and solution is found by ensuring that the valence sum rule is obeyed around each atom in the system.
In 1996 Wang and Liebau 99) observed, that using the tabulated bond valence parameters of Brese and O'Keeffe, 74) the valence sum rule is not always obeyed around atoms with lone pairs, the valence sum being larger the greater the distortion.
The two-body potential model seeks an arrangement of the ions that minimizes a single variable (the energy), while the bond valence model requires the valence sum rule (and the equal valence rule) be obeyed around each ion in the system.
On the other hand, Jensen et al. (48) showed that, contrary to the claims of Wang and Liebau described above, the valence sum rule is obeyed around Sn2+ using b equal to 0.37 Å. Wang and Liebau followed their first paper with others which showed that the increase in the bond valence sum with distortion is a characteristic of all the lone-pair cations when bonded to a single kind of anion.
Similar(55)
Guests obeyed, and slipped around the house's corner, past a chicken wire gate and through a fissure between two buildings so slim that some passed sideways.
Experiments show that the model for plane hyperbolic flow is obeyed in a large region around the stagnation point.
Everyone obeyed".
Many obeyed.
I obeyed.
They obeyed.
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Justyna Jupowicz-Kozak
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