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Definition of an ion. An ion is an atom that is charged and it can be positive or negative.

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Parts of an ion. Electron, nucleus, proton and neutron.

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Negative and positive ions

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Negative ions, healthy air

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Positive ions, damaged air

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This is a negative ion because there are more electrons than neutrons

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And this is a positive ion because there are less electrons than neutrons

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The end

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Warden, warden.