Platinum crystallizes into a cubic lattice structure that has a total of four Pt atoms per unit cell.
(a) What type of unit cell does platinum form?
(b) What is the mass of a unit cell of platinum?
(c) If the density of platinum is 21.45 g/cm3, what are the edge length of the unit cell and the atomic radius of platinum, respectively? (Express the edge length and atomic radius in picometers.)