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I am not entirely sure if its just associated to this topic but how exactly are we supposed to know that in a compound for eg NH4Cl we have to dissociate NH4 and Cl as its a salt and then draw the specific Lewis Structures? Basically when do we know it's not a covalent i.e sharing of electrons between the elements?
For me, I think it's easier just to have a grasp of the most common polyatomic ions and look out for those in the chemical formulas given to you. If there is an ion in it, then it forms an ionic bond and if none, it's covalent.
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