Problem- SrS has a face-centered cubic unit cell in which the S^2- anions occupy corners and face centers, while the cations fit into the hole between adjacent anions. What is the radius of Sr^2+ if the ionic radius of S^2- is 184.0 pm and density of SrS is 3.700 g/cm^3?
I don't know how to reach these answers so please show the steps, thank you!