For an FCC unit cell, (a) how many atoms are there inside the unit cell, (b) what is the…

For an FCC unit cell, (a) how many atoms are there inside the unit cell, (b) what is the coordination number for the atoms, (c) what is the relationship between the length of the side a of the FCC unit cell and the radius of its atoms, and (d) what is the atomic packing factor?