1. The problem statement, all variables and given/known data Complete the simple displacement reactions and balance any chemical reactions. 2. Relevant equations copper + silver nitrate → __________ + ____________ 3. The attempt at a solution Since copper on the periodic table can be Cu2+ or Cu+, my solution was copper + silver nitrate → copper (I) nitrate + silver The answer says: copper (II) nitrate. I don't know why this works when NO3- has a 1- charge.