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)


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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