10. Which one is denser in a BCC unit cell, ( 110) or (101) ? 11. Calculate the linear atomic density in the [110] direction for the iron BCC which has a lattice constant, a equal to 0.30nm. 12. Iron (Fe) can exist in the FCC or BCC structure. For FCC iron, the crystal lattice parameter is a =0.3515nm and iron atoms have an atomic radius of 0.1263nm. Which structure is denser, FCC or BCC