atom

The smallest unit of an element, having all the characteristics of that element and consisting of a very small and dense central nucleus containing protons and neutrons, surrounded by one or more shells of orbiting electrons.

Synonym: 
atoms
Citation: 
Adapted from "atom." (n.d.) American Heritage® Dictionary of the English Language, Fifth Edition. (2011). Retrieved September 18 2015 from http://www.thefreedictionary.com/atom
English

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