$A$ compound made of elements $A$ and $B$ forms an $fcc$ structure. Atoms of $A$ are at the corners and atoms of $B$ are present at the centres of the faces of the cube. What is the formula of the compound?
- A$AB$
- B$AB_2$
- C$AB_3$
- D$A_2B$
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$(i)$ What is meant by the term 'coordination number'?
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