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The coordination number of Al in the cry...

The coordination number of `Al` in the crystalline state of `AlCl_(3)` is _____.

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At low temperature . `AlCl_(3)` exists as a close paked lattice of ` Cl^(-)` ions with ` Al^(3+)` ions occupying octahedral voids. Thus, ` Al^(3+)` ions has 6 `Cl^(-)` ions around it. Hence, its corrdination number is 6.
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