What is valency of Nitrogen in NO,N2O,NO2,N2O5?

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What is valency of Nitrogen in NO,N2O,NO2,N2O5?

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The valency of Oxygen is always -2 and since these are all molecules, their total valency = 0 NO N – 2 = 0 N = +2 N2O 2N -2 = 0 2N = 2 N = +1 NO2 N – 4 = 0 N = +4 N2O5 2N -10 = 0 2N = 10 N = +5