Formula of a compound from the positions of its atoms in a cubic unit cell

1. A.
   AB
2. B.
   $AB_2$
3. C.
   $AB_3$
4. D.
   $A_2B$

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1. A.
   $\mathrm{A_7B_8}$
2. B.
   $\mathrm{A_7B_3}$
3. C.
   $\mathrm{AB_3}$
4. D.
   $\mathrm{A_7B_{24}}$

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1. A.
   AB
2. B.
   $\mathrm{A_2B}$
3. C.
   $\mathrm{AB_2}$
4. D.
   $\mathrm{A_2B_2}$

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