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A rough estimate of the radius of a nucleus is provided by the formula r  kA1/3, where k is approximately 1.3  1013 cm and A is the mass number of the nucleus. Estimate the density of the nucleus of 127I (which has a nuclear mass of 2.1  1022 g) in grams per cubic centimeter. Compare with the density of solid iodine, 4.93 g cm3
I solved and got 1.80 x 10^14 but that doesn't seem correct.
Why not? :)

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It seems like a rather large number when the density of solid Iodine is 4.93 g/cm ^3 :o
Indeed it does. That would imply that most of solid iodine is empty space, wouldn't it? :)
ahhhh, Thanks :D
Imagine what would happen to an object if all of its nuclei were squished together instead of being surrounded by empty space. Such an object is called a neutron star, and its density is immense.

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