Metallic sodium has a body-centred cubic unit cell. How many atoms are contained in one unit cell?

Crystalline solid AB has face-centred cubic unit cell. Corners and the face centres of unit cell are occupied by atoms A. The edge centres and body centre of the unit cell are occupied by atoms B. If all the face-centred atoms along one of the axes are removed, then resulting chemical formula of the solid will become-

How many atoms are present in body centred unit cubic cell ?

The unit cell of metallic gold is face -centred cubic. How many atoms occupy the gold unit cell? What is the mass of a gold unit cell ?

A body centred unit cell has an atom at the each vertex and at --------- of the unit cell.

A body centred unit cell has an atom at the each vertex and at --------- of the unit cell.

A body centred unit cell has an atom at the each vertex and at --------- of the unit cell.

A body centred unit cell has an atom at the each vertex and at --------- of the unit cell.

A body centred unit cell has an atom at the each vertex and at --------- of the unit cell.

Packing efficiency of body-centred cubic unit cell is _________ and that of face-centred cubic unit cell is _______.