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Electrons and the Periodic Table
Know how many electrons are in each energy level and how that relates to the Periodic Table.
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| A | B |
|---|
| up to 2 electrons | energy level 1 |
| up to 8 electrons | energy level 2 |
| up to 18 electrons | energy level 3 |
| up to 32 electrons | enery level 4 |
| Period 1 | Row 1, 1st energy level |
| Period 2 | Row 2, 2nd energy level |
| Period 3 | Row 3, 3rd energy level |
| Period 4 | Row 4, 4th energy level |
| Number of energy levels | 7 |
| highest energy level | level 7 |
| lowest energy level | level 1 |
| filled energy level | noble gases |
| similar properties | same group or column |
| hydrogen, #1 | 1 proton, 1 electron |
| helium, #2 | 2 protons, 2 electrons |
| lithium, #3 | 3 protons, 3 electrons |
| beryllium, #4 | 4 protons, 4 electrons |
| carbon, #6 | 6 protons, 6 electrons |
| argon, #18 | 18 protons, 18 electrons |
| electron dot diagram | symbol, dots for outer electrons |
| group 1A | 1 valence electron |
| group 2A | 2 valence electrons |
| group 3A | 3 valence electrons |
| group 4A | 4 valence electrons |
| group 5A | 5 valence electrons |
| group 6A | 6 valence electrons |
| group 7A | 7 valence electrons |
| group 8A | 8 valence electrons |
| group 1A ions | +1, lose 1 electron |
| group 2A ions | +2, lose 2 electrons |
| group 3A ions | +3, lose 3 electrons |
| group 4A ions | +4 or -4, lose or gain 4 electrons |
| group 5A ions | gain 3 electrons |
| group 6A ions | gain 2 electrons |
| group 7A ions | gain 1 electron |
| group 8 A | stable, do not lose or gain electrons |
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