The number of atoms/molecules contained in one body-centered cubic unit cell is

The number of atoms contained in one face-centred cubic $(FCC)$ unit cell of a monoatomic substance is:

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

$A$ solid has a structure in which $W$ atoms are located at the corners of a cubic lattice,$O$ atoms are at the center of the edges,and $Na$ atoms are at the center of the cube. The formula for the compound is:

What is the coordination number of a cation present in a tetrahedral void?

The crystal structure of $AB$ is of $NaCl$ type. If the radius of the $A^+$ ion is $x \ pm$ and the radius of the $B^-$ ion is $y \ pm$, then the edge length of the unit cell will be ..........