Two small aluminum spheres, each having mass 0.0250 kg, are

Two small aluminum spheres, each having mass 0.0250 kg, are separated by 80.0 cm.
(a) How many electrons does each sphere contain? (The atomic mass of aluminum is 26.982 g/mol, and its atomic number is 13.)
(b) How many electrons would have to be removed from one sphere and added to the other to cause an attractive force between the spheres of magnitude 1.00 X 104 N (roughly I ton)? Assume that the spheres may be treated as point charges.
(c) What fraction of all the electrons in each sphere does this represent?

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