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.

Jan 2nd, 2015

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