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- 12. Shells and the Electron Cloud
- 15. Periodic Table Periods go across on the periodic table Periods have the same number of “shells” 1 2 3 4 5 6 7
- 16. Periodic Table Groups go down on the periodic table Elements in the same group, have the same number of valence electrons 1 2 3 4 5 6 8 7
- 17. Let’s look at a few elements… Hydrogen 1= Proton 1= electron
- 18. Let’s look at a few elements… Helium 2=protons 2=neutrons 2=electrons
- 19. Let’s look at a few elements… Lithium 3=protons 4=neutrons 3=electrons
- 20. Let’s look at a few elements… Fluorine 9=protons 10=neutrons 9=electrons
- 21. Let’s look at a few elements… Argon 18=protons 22=neutrons 18=electrons