2Na + 3S --> Na2 + S3^2- 1. The problem statement, all variables and given/known data So I have the equation 2Na + 3S --> Na2 + S3^2- (the 2- being the charge of S3) This is the reaction generated in a sodium-sulfur battery. And all's good there, I can see there are two electrons transferred in the reaction and I know it's a redox reaction. However when I handed in my draft for this piece of assessment, I got it back with the comment that this reaction didn't look 'right'. The task at hand is to summarise an article (Mine being on Electric Cars) and then write four 'focus' questions and model answers. So the reaction is taken straight from the article and I just don't see how it isn't right. Thanks for any help clearing this up, I plan to ask my teacher tomorrow, so I'll keep this updated.