Principal energy levels of gold (Au)
The figure shows the organization of the electrons around the nucleus of a gold (Au) atom. Notice that the first energy level (closest to the nucleus) can have only two electrons, while more electrons can 'fit' within a given level further out. The number of electrons in each level is listed on the upper right corner of the figure. Notice that the outermost level has only one electron.
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"Electron shell diagram for Gold."
http://commons.wikimedia.org/wiki/File:Electron_shell_079_Gold.svg
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