Electron Shells

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Electron Shells

ELECTRON SHELL RULES

1. Electrons always occupy shells

2. The lowest energy levels are always filled first the ones closest to the nucleus

3. only a certain number of electrons allowed

1St 2   2nd  8  3rd  8

4. Atoms are much happier when the shells are full like noble gases

5. In most atoms outer shell is not full and this makes it want to react.

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