What happens when nitrogen fills its valence shell?

The choices can be found elsewhere and as follows:

A.Three electrons are lost, Creating N+3
B. Three electrons are lost, Creating N-3
C.Three electrons are gained, Creating N+3
D.Three electrons are gained, Creating N-3

I think the correct answer is option D. When nitrogen fills its valence shell then three electrons are gained, Creating N-3. Hope this answers the question.

An ecosystem is in a certain area and includes living and non living plus there is weather conditions and a biome is a large amount of area with similar climate.so ecosystem is based on weather and biome is based on the average climate 

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