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10 x -15 = 1 Femtometre

10 x -15 = 1 Femtometre Nuclear Sizes are on the order of femtometers which in the nuclear context are usually called fermis, = 10 x -15. http://hyperphysics.phy-astr.gsu.edu/hbase/nuclear/nucuni.html Protons are roughly 10-15 Quarks are roughly 10-18
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