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Why does PCl(5) exist as [PCl(4)]^(+)[PC...

Why does `PCl_(5)` exist as `[PCl_(4)]^(+)[PCl_(6)]^(-)` in the crystalline state?

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`PCl_(5)` has unsymmetrical structure because of different axial and equatorial bonds. Therefore, it is unstable and it changes to tetrahedral `[PCl_(4)]^(+)` and octahedral `[PCl_(6)]^(-)` ions, which have stable geometries.
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