Activity VI.C

K has an ionic radius of 1.33 Å (diameter = 2.66 Å), while Cs has an ionic radius of 1.69 Å (diameter = 3.38 Å). On the scale of our models, these correspond to spheres of approximate diameter 6.1 cm (2.4 inches) and 7.6 cm (3.0 inches), respectively. Place a ball of appropriate size inside C and C fullerenes in order to get a physical picture of the "shrink-wrapped" endohedral fullerene complexes.

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