What is the stable configuration of the nitride ion (N^-3)

1 s^2 ^2 s^2 2 p ^6

Explanation:

Nitride is just an N 3 - ion. We know this because the - ide - suffex indicates a mono atomic anion, and we assume that the anion will have enough additional electrons to achieve a noble gas configuration (nitrogen is 3 electrons short of a full octet).