Question

write please.........​

Answer 1

Answer:

17. for face centered cubic,

                        4r=√2×408

                          r=√2×102

                          r=1.44×102

                          r=1.44×102

                           =146.88

   ∴Diameter=2×146.88

                    =293.76≈288

18. Number of atoms occupied by N=x

     Number of tetrahedral voids occupied by M=1/3×2x

      ∴Ratio=M2/3x/Nx

                =M2N3