Draw one of the Lewis structure of the N2O5. In each case one oxygen bridges the nitrogens (N-O-N single bond) and 2 other oxygens are bonded to each N. How many equivalent resonance structures are there that satisfy the octet rule and where O makes at most 2 bonds?

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http://www.thegeoexchange.org/chemistry/bonding/Lewis-Structures/N2O5-lewis-structure.html