In an $fcc$ structure,the location of the octahedral void is at ........

If an atom is present in the centre of the cube,the participation of that atom per unit cell is

The vacant space in the $bcc$ unit cell is .............. $\%$

How many "nearest" and "next nearest" neighbours,respectively,does potassium have in a $bcc$ lattice?

In a diamond crystal,each carbon atom is linked with other carbon atoms. The number of carbon atoms in a diamond unit cell is:

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 ...........