Lithium Atom
Stylized lithium-7 atom: 3 protons (red), 4 neutrons (blue), and 3 electrons (black). (Lithium also has another, rarer isotope with only 2 neutrons. )
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"File:Stylised Lithium Atom.svg - Wikipedia, the free encyclopedia."
http://en.wikipedia.org/w/index.php?title=File:Stylised_Lithium_Atom.svg&page=1
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