To calculate the density of plutonium, one cannot use the standard gas volume of 22.4 L, as plutonium is a solid at standard temperature and pressure (STP). Instead, the density calculation requires the lattice parameter and the molar mass, which must be converted to appropriate units (kg or grams). The crystal structure of plutonium is monoclinic, and the atomic radius is 175 pm (0.175 nm). The density can be expressed in either kg/m³ or g/cm³, depending on the unit system used. Understanding these parameters is essential for accurately determining plutonium's density.
