[[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
An '''atom''' is
−
a [[particle]] of [[matter]] indivisible by [[chemical]] means. <ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms] </ref>
+
a [[particle]] of [[matter]] indivisible by [[chemical]] means <ref>[http://www.lbl.gov/abc/Glossary.html Glossary of Nuclear Terms] </ref> which form the building blocks of molecules.
The word atom comes from the Greek term for indivisible, ''átomos''.
The word atom comes from the Greek term for indivisible, ''átomos''.