Core: Electron Shells
- Created by: jross10
- Created on: 30-03-15 14:20
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- Electron shells
- rules
- electrons always occupy shells (energy levels)
- lowest energy levels filled first - ones closest to the nucleus
- only a certain number of electrons are allowed in each shell
- 1st shell: 2
- 2nd shell: 8
- 3rd shell: 8
- atoms happier when they have full outer shells
- most atoms the outer shell is not full
- makes atom want to react
- Rules help to work out electronic configurations
- example Nitrogen
- 1 - has seven protons so has seven electrons
- 2 - first shell can only take 2 electrons and the second shell can take a max of 8 electrons
- 3 - electronic configuration must be 2.5
- example Nitrogen
- rules
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