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now on this video we will review over the basics of writing chemical formulas and uh you will need to have your chart of polyatomic ions out in front of you and you will need to have your periodic table out in front of you in order to do these problems now as a review of your periodic table you should have your ion charges written at the top of each group on the periodic table and if you do not you need to take a moment and do so now your group one elements will have a plus one charge your group two will have a plus two charge your transitionals will have a plus 1 2 or 3 depending upon the chemical formula and well discuss that a little bit later your group 13 would have a plus 3 right here we would have a plus or minus four minus three minus two minus one and zero now if you have uh forgotten your chart of polyatomic ions i did put this one in for you that you can refer back to as you need to now i am going to go through this from memory so if youre wondering where i got the formula