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It is not the case that In ionic compounds, an individual ion bears no special directional relationship to any one of its neighbors.
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Reasons For
2 perspectives
Reason for 1 of 2
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1.
Crystal lattice geometry imposes determinate spatial constraints: each ion occupies fixed coordination sites with specific angular relationships to neighbors.
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2.
In NaCl, each Na+ ion has exactly 6 Cl- neighbors at 90° intervals, constituting a privileged directional structure determined by lattice symmetry.
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3.
A relationship that is geometrically fixed and empirically measurable cannot be correctly described as bearing 'no special directional relationship' to its neighbors.
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Reason for 2 of 2
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1.
Pauling's rules for ionic crystal structures establish that coordination polyhedra have definite geometries, meaning directionality is encoded in the stable equilibrium configuration.
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2.
The distinction between the isotropy of the force law and the anisotropy of the resulting structure is a recognized error of conflation in structural chemistry, as Hoffmann and others have noted.
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Reasons Against
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Reason against
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1.
In ionic compounds, bonding is electrostatic.
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2.
Electrostatic bonding is radially symmetrical.
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3.
Radially symmetrical bonding does not privilege any particular neighbor direction.
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