In a $bcc$ unit cell,what is the number of atoms per unit cell?

In an $NaCl$ crystal,how many $Cl^{-}$ ions surround each $Na^{+}$ ion?

In an alloy of metals $M$ and $N$,$N$ atoms form a $bcc$ structure,while $M$ atoms occupy the center of each face. If the cube is cut such that all atoms along one body diagonal are removed,the formula of the resulting solid will be ...........

If three elements $X$,$Y$ and $Z$ crystallise in a $ccp$ lattice with $X$ atoms at the corners,$Y$ atoms at the cube centre and $Z$ atoms at the edges centre,the formula of the compound will be

$A$ compound having elements $X$ and $Y$ crystallises in a cubic structure, where $X$ is at the corner position and $Y$ is at the center of the cube. The correct formula of the compound is

Coordination numbers of $Zn^{2+}$ and $S^{2-}$ in the crystal structure of wurtzite are