What is the oxidation state of silicon in the SiO2 compound, what is the oxidation state of nitrogen in the N2O5 compound

What is the oxidation state of silicon in the SiO2 compound, what is the oxidation state of nitrogen in the N2O5 compound, what is the oxidation state of sulfur in the SO3 compound.

In SiO2, the oxidation state of silicon is +4
In N2O5, the oxidation state of nitrogen is +5
In SO3, the oxidation state of sulfur is +6



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