#### The coordination number and distance between nearest neighbour in BCC structure is Option 1) 6 ,  Option 2)  8 , Option 3) 6 , Option 4) 8 ,

The 8 corner atoms are in contact with body centred atom in BCC structure. Hence its coordination number is 8 and distance between a corner and body centre is

Coordination number -

Total number of atom touching a particular atom in the given unit cell is known as coordination number and that atoms are known as nearest neighbour.

- wherein

Unit cell                      Coordination number

1. Primitive                              6
2. BCC                                    8
3. FCC                                    12
4. HCP                                    12

Coordination number -

Total number of atom touching a particular atom in the given unit cell is known as coordination number and that atoms are known as nearest neighbour.

- wherein

Unit cell                      Coordination number

1. Primitive                              6
2. BCC                                    8
3. FCC                                    12
4. HCP                                    12

Option 1)

6 ,

This is incorrect

Option 2)

8 ,

This is incorrect

Option 3)

6 ,

This is incorrect

Option 4)

8 ,

This is correct