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## Homework Statement

A small piece of aluminum(atomic number 13) contains 10

^{15}. (The atomic number is the number of protons; it determines the (positive) electric charge of the nucleus and, thus, the number of electrons in a neutral atom.) If the piece of aluminum has a net positive charge of 3.0 micro Coulombs, what fraction of the electrons that the aluminum had when it was neutral would have had to be lost?

## Homework Equations

Avogaddro's number might be needed.

I am not sure exactly what I need as far as equations go.

I know what the answer is, but I am unsure of how to get it.

Answer: 3/2080

## The Attempt at a Solution

I don't know how to work this problem fully. I have an idea, but I get stuck along the way.