ANSWERS could be 1:1 ,1:2,,2:1,2:3and3:2
So, we have to look at the charges to determine the ratio.
N has a charge of -3, and Na has a charge of +1. So, in order to have an even ratio, we would need three Na (for a total of +3) to bond with one N (who has a charge of N)
So the ratio of Na to N would be 3:1.
Hope this helps.
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