Assume that atoms are hard spheres, and use the metallic radius of 186 pm for Na to estimate the volumes of one Na atom and of one mole of Na atoms. How does your result compare with the atomic volume found in Figure 9-1? Why is there so much disagreement between the two values?

Figure 9-1

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Atomic (molar) volume, 103 cm³/mol 80 70 H 60 50 40 30 20 10 I T Li Na 10 K 20 30 Rb 40 50 Atomic number 60 70 80 90 100