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Negative ions, static charge

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In a famous experiment with a balloon and wool.

http://phet.colorado.edu/sims/html/b...ricity_en.html

Initially the balloon and wool pullover have no ions.

I understand how positive ions are formed, that you apply energy to the electron, thus electron overcomes the attracted force created by a proton, but how are the negative ions created?

I assume when we rub the balloon with a wool pullover we apply energy to both materials, thus depending on a material (how tight electrons to the nucleus) electrons are escaped from both materials forming positive ions.

BUT, I dont understand how the negative ions created, why would atom which is in equilibrium get more electrons and why at the end we get 2 charged materials?

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