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better definition - a particle of matter indivisible by chemical means
[[Image:Atoms1.jpg|thumb|right|Subatomic resolution of atoms by AFM]]
[[Image:Atoms1.jpg|thumb|right|Subatomic resolution of atoms by AFM]]
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
a [[particle]] of [[matter]] indivisible by [[chemical]] means. <ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms] </ref>
The word atom comes from the Greek term for indivisible, ''átomos''.
===Structure===
===Structure===