-5.55e-19 C, -9.25e-19 C, -1.11e-18 C, and -1.48e-18 C. What is the smallest difference in charge between any two drops? If this is assumed to be the charge on the electron, how many excess electrons are there on each drop?

Difference

-3.70E-19

-1.85E-19

Smallest difference is -1.85E-19

-3.20 E-19 charge on one electron

-5.55E-19 << excess 1 electron

-9.25E-19 << excess 3 electron

-1.11E-18 << excess 5 electron

-1.48E-18 << excess 7 electron

Reference:

https://answers.yahoo.com/question/index?qid=20120919195216AANAbDi

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