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There are four possible structure for xenon trioxide. The fourth structure shown below is the most stable as the formal charge for all atoms are 0. (Stefano)

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There are three forms of N2O. In the process of choosing which is most stable, structure 3 is eliminated because the formal charges are furthest from zero. Between structure 1 and 2, it is preferable in terms of structure for the formal charge to be on the more electronegative element, and oxygen is more electronegative than nitrogen, therefore structure 1 is the most stable/preferred structure. (subin)

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Structure 2 is more stable because the electronegativity of oxygen is higher than nitrogen, so a negative charge on oxygen is more stable than a negative charge on nitrogen. (Ben)