If the radius of an anion is double that of a cation,the coordination number of the cation and the type of hole occupied are respectively:

The sum of the number of first and second nearest neighbors in an $FCC$ closed packing is:

What is the coordination number of a cation occupying an octahedral void?

The unit cell of a binary compound of $A$ and $B$ metals has a $ccp$ structure with $A$ atoms occupying the corners and $B$ atoms occupying the centres of each face of the cubic unit cell. If during the crystallisation of this alloy,two $A$ atoms are missing from the unit cell,the overall composition per unit cell is:

What is the minimum value of the radius ratio ${r_ + }/{r_ - }$ for $NaCl$ to ensure that anion-anion contact does not occur?

What does the unit cell of $CsCl$ contain?