Solid State|Coordination Number

Solid State L5

Solid State L1

Solid State L3

Solid State L8

Solid State L7

Solid State L2

Solid State L4

Solid State L6

In which of the following type of solids, the coordination number and packing efficiency are same :

For the structure of solid given below, if the lattice points represent A^(+) ions and the B^(-) ioins occupy the tetrahedral voids, then coordination number of A is :