The coordination number of bcc structure is 8.

Explanation:
Firstly let us know what is bcc structure and what is coordination number.

BCC (Body Centric Cubic) Structure: This structure consists of atoms arranged in a cube. In here there is an atom at every corner of the cube with one atom at the centre of the cube.

Coordination number: It is the number of atoms, ions or molecules that a central atom or ion holds in a complex compound or crystal.

So, in the bcc structure, the central atom in the middle of the cube bonds with 8 atoms at the corners of the cubical structure. Thus, the coordination number of bcc structure is 8.