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Manganese can form crystals with a body-centered cubic lattice structure. If the length of one side of the unit cell for this form of manganese is 3.21 A, what is the density of this form of manganese in grams per cubic centimeter? 7.57 x g/cm³ Did you remember to determine the number of atoms per unit cell? Did you remember to use the average atomic mass to calculate the mass of a given number of atoms? Did you remember to find the volume of the unit cell? Supporting Materials Periodic Table Supplemental Data Constants and Factors Additional Materials Tutorial

Determine the fractions of an atom in (a) and (b) at the center, and at a single face, edge, or corner of the unit cells pictured below. (a) cesium chloride (Cs* is green, Cl- is gold.) Center Face Edge Corner Cs+ 0 1/2 ✓X 0 CI 1 1/4 X (b) sodium chloride (CI is grey, Na+ is green.) Center Face 1/8 V ✓ x 1/2 Edge 1/4 0 0 Corner X CI 1 0 ✓ x ✓ ✓✓ ✓ 1/2 Na+ 0 0 ✓ 1/8 x Did you remember the characteristics of a primitive-centered cubic, body-centered cubic, and face-centered cubic unit cell? ✓