In an experiment it was found that the total charge on an oil drop was 5.93 3 10218 C. How many negative charges does the drop contain?   We’re being asked to determine how many negative charges a drop contains from an oil drop experiment where the total charge was 5.93x10-18 C. The drop contains 37 negative charges. This is the answer Isn't the experiment about getting the oil drop to stay in place? Wouldn't this mean that there are positive charges as well? Where is the answer for how many positive charges are in an oil drop? Is an oil drop just negative in this example?

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Atoms and Molecules

An atom is the smallest unit of an element that possesses all the properties of that particular element. Molecules are the smallest unit of a substance that possess all the properties of that particular substance.