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The google slide is attached to the assignment.

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Conclusion: All elements in the same group have the same charge. Nitrogen and Phosphorus both have -3 charge.

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https://docs.google.com/presentation/d/1ZdmOisE_HdSTX1ZjgnpfO7tGdajQzovePkImS0bNBgQ/edit#slide=id.p1

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https://docs.google.com/presentation/d/1IwG28D0CUKKg2u5KD73VqzRQ9GQ1cOb8kvJL0Ud9Czg/edit?usp=sharing\

all ions in the same group have the same charge