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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Coordination polyhedra(as used in chemistry and geometry): Three-dimensional shapes formed when one central atom is surrounded by other atoms arranged at specific distances and angles around it.
Ionic crystal structures(as used in chemistry): Solid materials made of positively and negatively charged atoms (ions) packed together in a repeating, organized geometric pattern.
Pauling's rules(as used in chemistry and crystallography): A set of guidelines created by chemist Linus Pauling that predict how atoms arrange themselves in crystal structures to be most stable and balanced.
Stable equilibrium configuration(as used in physics and chemistry): An arrangement of atoms where everything is balanced and settled into a position that requires minimal energy to maintain, like a ball resting at the bottom of a bowl.

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