What are the coordination number (C.N.) of $\mathrm{C}{\mathrm{a}}^{2+}$ and ${\mathrm{F}}^{-}$ ion in calcium fluoride $\left(\mathrm{C}\mathrm{a}{\mathrm{F}}_2\right)$ crystal structure?

• A

  C.N. of $\mathrm{C}{\mathrm{a}}^{2+}=4$ and ${\mathrm{F}}^{-}=8$
• B

  C.N. of $\mathrm{C}{\mathrm{a}}^{2+}=6$ and ${\mathrm{F}}^{-}=6$
• C

  C.N. of $\mathrm{C}{\mathrm{a}}^{2+}=8$ and ${\mathrm{F}}^{-}=8$
• Correct answer
  D

  C.N. of $\mathrm{C}{\mathrm{a}}^{2+}=8$ and ${\mathrm{F}}^{-}=4$

Hence, the correct answer is option: 'D'.