What is the covalence of nitrogen in n2o5?

Lewis structure of N2O5 is : 

:O : : O: 

II II 

N N 

/ \ / \ 

:O: :O: :O : 

.. .. 

or or O2 N-O- NO2 

So the covalency of nitrogen is 3 only as one pair of electrons is coordinated with oxygen shown here as having all the six electrons intact.

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