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Charges are quantized. This means that they have quantities. Therefore, q=ne. q is the the charge, n is the number of electrons you are trying to find, and e is the charge on the electron. Remember that your given charge is in micro coulombs, and you'll have to turn that into coulombs. -21x10^-6 c/1.6X10^-19c =n, this will give you the number of extra electrons. hope this helps!

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