a) Calculate the packing factor of SiC unit cell (a zinc blende structure material) (15 points)b) Calculate the packing factor of Cu, a FCC metal. (9 points)c) Compare the packing factor of SiC and Cu and explain why it makes sense in terms of bonding. (6 points)ElectronegativityAtomic Radius (nm)Ionic Radius (nm)Si (silicon)1.80.1180.040 (Si+4)C (carbon)2.50.0710.016 (C+4)Cu (copper)2.40.1280.096(Cu+1)