Atoms of Solid Polonium Are Packed in a Repeating Array

Atoms of solid polonium are packed in a repeating array that can be represented by a cubic unit cell, which is the simplest three-dimensional cross-section that repeats throughout the solid. If the atomic radius r is 1.67 × 10⁻⁸ cm and the mass of one polonium atom is 3.47 × 10⁻²² g, which expression correctly calculates the density of a pure sample of solid polonium?

A) (3.47×10−22 g) (1.67×10−8 cm) 33.47×10-22 g1.67×10-8 cm3
B) 8×(3.47×10−22 g) (1.67×10−8 cm) 38×3.47×10-22 g1.67×10-8 cm3
C) (3.47×10−22 g) (2×1.67×10−8 cm) 33.47×10-22 g2×1.67×10-8 cm3
D) 8×(3.47×10−22 g) (43π) (1.67×10−8 cm) 38×3.47×10-22 g43π1.67×10-8 cm3

Correct Answer:

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