It would be zero.
NO2 is a acidic gas. Nitrogen shows +4 oxidation number.
Nitrogen is in the 3- oxidation state in calcium nitride.
+5 oxidation state
nitroxide
-3
Oxidation state of nitrogen.
There are no nitrogen atoms in CaCO3!
In NH3 the oxidation state of Nitrogen is -3. It has 3 extra electrons in three polar covalent bonds, 'donated' from three bonded hydrogen atoms. Hydrogen has an oxidation state of +1 in this compound.
-3
-3
Nitrosyl [NO+] has Nitrogen in +3 oxidation state and Oxygen in -2
It is zero since it is a free element and it does not react with anything