Calculate the total number of atoms in a $bcc$ crystal lattice containing $2 \times 10^{23}$ unit cells.

In a solid $AB$,$A$ atoms are in $ccp$ arrangement and $B$ atoms occupy all the octahedral sites. If two atoms from the opposite faces are removed,then the resultant stoichiometry of the compound is $A_{x} B_{y}$. The value of $x$ is ..... [nearest integer]

In a hexagonal close packing $(hcp)$ lattice,each sphere touches ................... spheres in its own layer.

In a face-centered cubic $(FCC)$ lattice,$A$ atoms are present at the corners and $B$ atoms are present at the face centers. If one $B$ atom is removed from one of the face centers,what will be the molecular formula of the compound?

Potassium crystallizes in a $bcc$ lattice. What is the coordination number of potassium in the potassium metal?

The ratio of cationic radius to anionic radius in an ionic crystal is greater than $0.732$. Its coordination number is