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Look at the Bohr diagrams on the board.
Look at the Lewis Dot Structures on the board
Draw up the Lewis Dot Structure for He and H.
H
What element is this Lewis Structure?
Remove all but the outer most electron level.
Lets look at Oxygen
1st
2nd
Remove the nucleus
What are the slimilarities?
differences?
3rd
Remove the ring- leaving just the outer electrons
Draw the Lewis Dot Structure for the other elements- Li, B, . . .
Bohr
Lewis Dot
vs.
Add in the symbol for the element
4th
O