Question

what happens when nitrogen fills its valence shell?
○ three electrons are gained, creating n⁺³
○ three electrons are lost, creating n⁺³
○ three electrons are lost, creating n⁻³
○ three electrons are gained, creating n⁻³

Explanation:

Nitrogen has 5 valence - electrons and needs 3 more to fill its valence shell (to achieve an octet). Gaining electrons results in a negatively - charged ion. When nitrogen gains 3 electrons, it forms $N^{-3}$.

Answer:

Three electrons are gained, creating $N^{-3}$