it is written in book that while calculating density, z=1 for ionic compounds such as CsCl forming BCC structures but - Chemistry - The Solid State

Question

it is written in book that while calculating density, z=1 for
ionic compounds such as CsCl forming BCC structures but in bcc
structures no of atoms =2 then why have we taken Z=1

Kirti Gogia · Accepted Answer

You yourself answered the question correctly In case of ionic
compounds, we consider the number of formula units per unit cell
Thus, Z will denote the number of formula units per unit cell and
not the number of individual ions Since CsCl has BCC structure,
therefore Z = 1
Another important point to note is that for ionic compounds, we
use the term formula units and not molecules Molecules are formed
by sharing of atoms and not by transfer of electrons

it is written in book that while calculating density, z=1 for ionic compounds such as CsCl forming BCC structures.but in bcc structures no of atoms =2 then why have we taken Z=1