(C) The fluorite structure $(CaF_2)$ consists of a face-centered cubic $(fcc)$ arrangement of $Ca^{2+}$ ions.Each $Ca^{2+}$ ion is surrounded by $8$ $

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(C) The fluorite structure $(CaF_2)$ consists of a face-centered cubic $(fcc)$ arrangement of $Ca^{2+}$ ions.Each $Ca^{2+}$ ion is surrounded by $8$ $F^-$ ions,and each $F^-$ ion is surrounded by $4$ $Ca^{2+}$ ions.Therefore,the coordination number of $Ca^{2+}$ is $8$ and the coordination number of $F^-$ is $4$,resulting in an $8:4$ coordination ratio.