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1.3 Elements of Life

Shells of Electrons

Shell Electron Configuration No. of Electrons
n=1 2x e in s subshell 2
n=2 2x e in s subshell 8
6x e in p subshell
n=3 2x e in s subshell 18
6x e in p subshell
10x e in d subshell
n=4…

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Electronic Configuration
Electron configuration is show in
boxes with one electron spinning
upwards and another spinning
downwards. The picture to the
left shows the electron
configurations for the elements of
period 2.
Electron configuration can be
written short hand as [nearest
noble gas] and then the following
configuration.
1

e.g.…

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