Na+ + NO3- --> NaNO3
The oxidation sum is zero for NaNO3.
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The additive identity is zero. When you add a number and 0, the sum equals the original number.
Anything multiplied by zero is zero - no matter how complex the sum !
If you add zero to any number, the sum is the same number you started with.
The sum of the first 1,000 counting numbers (which excludes zero) is 500,001.
the sum of 18 and a number equals 24