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An '''atom''' is the smallest unit of chemical element that still retains the element's properties. The word atom comes from the Greek term for indivisible, ''átomos''. There have been many ideas about how atoms may look. The current one is called the [[Quantum Mechanical Model]]{{fact}}, and is very complex.{{fact}}
An '''atom''' is the smallest unit of chemical element that still retains the element's properties. The word atom comes from the Greek term for indivisible, ''átomos''.
===Structure===
===Structure===