How do I figure out the number of shells in noble gas items? (1 Viewer)

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I am confused? Do I look at somewhere on the periodic table? For example for the noble gas items argon, radon, helium, and neon?
 
I hope that I posted this in the right section as well..
 

mathman

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If you look at the periodic table, then the number of completed shells corresponds to the order as you go down the list. Helium - 1, Neon - 2, Argon - 3, etc.
 
See http://en.wikipedia.org/wiki/Electron_configuration" [Broken]. The first illustration shows what you are interested in. Note the specific elements you want are along the right edge.
 
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