Cu(s) + NO3- (aq) --- Cu2+ (aq) + NO oxidation numbers

Question

Cu(s) + NO3- (aq) ---> Cu2+ (aq) + NO oxidation numbers

abmon98 · Answer

The oxidation state of an uncombined element is zero. Cu is 0
NO3-
The more electronegative element in a substance is given a negative oxidation state.
Oxygen is the more electronegative and is usally a -2 charge atom. There are 3 oxygen atoms present -2*3=-6
The oxidation state of all ions present in a compound must equal to the charge it carries 
-6+5=-1 
+5 is the oxidation state of  N present in NO3- 
Cu+2 is given and for NO 
oxygen is usually -2 and the compound is neutral (oxidation state =0) so nitrogen must equal to +2