You try! Use the periodic table and what you have learned about oxidation numbers to complete the following electron dot formulas.
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Directions: Drag the tiles to the correct location to create the electron dot formula. Show the correct number of valence electrons for the anion by clicking on the gray circles. Note that not all of the tiles will be used and not all spots will need a tile. Use the "previous" and "next" buttons to cycle through the six problems.