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Estimate the fraction of electrons in person's 70- kg body that were transferred to his friend. Note that the electron mass is about 1/20000 the mass of the atom − the nuclei are much more massive − and the mass of an average atom in the body is about 2×10−26 kg . Assume that each atom has 5 electrons on average. (Note: Don't get hung up on minutia − this is a rough estimate.)