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[Music] hi and welcome back to three sighs lessons co uk by the end of this video you should be able to determine the formula of an ionic compound using the charges on ions in the last video we looked at the charges on metal and nonmetal ions in this video were going to use these charges to work out the formula of ionic compounds heres the key rule which you need to learn in an ionic compound the charges on the ions have to cancel out to leave an overall charge of zero Im showing you three ionic compounds here and you can see that all of these have no overall charge no ionic compounds have an overall charge so were going to see how to work out the formula of an ionic compound lets start by looking at a simple ionic compound which is sodium chloride this contains the sodium ion and a closed and the chloride ion Cl - dont forget that youll be given the charges on any ions that you need in an exam question so how do we work out the formula of sodium chloride if we look at the ions