C2(i) - Bonding and Reactions 4.

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Electron Shells.

(http://www.chemistryforkids.net/sites/default/files/aluminum_0.png)2,8.3 (3rd shell still filling)

ELECTRON SHELL RULES:

1) Electrons always occupy shells (sometimes called energy levels.)

2) The lowest energy levels are always filled first these are the ones close to the nucleus.

3) Only a certain number of electrons are allowed in each shell:

1st shell: 2            2nd shell: 8         3rd shell: 8

4) Atoms are much happier when they have full electron shells like the noble gases in group 0.

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