Body centered cubic lattice has a coordination number of

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

The number of octahedral voids in a $BCC$ structure is:

The interionic distance for $Cesium$ $chloride$ $(CsCl)$ crystal will be (where $a$ is the edge length of the unit cell):

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

The structure of $ZnS$ is