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[[Image:Ehli.png|thumb|right|Depiction of the helium atom]]
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''.
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''.