Do you understand how a magnet works? one side of the magnet is charged positively and the other side is charged negatively. So "opposites attract" is from that, a magnet is attracted to a negative charge on it's positive charged side and to a positive charge on it's negative charged side. That is the beginning. If you want to learn how atoms work (as we perceive) then search the internet for "Live-Science What is an atom"
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