Respuesta :
Here is the answer to the question above. The formula unit of Sodium Nitride is this: Na3N. Sodium Nitride is inorganic compound and is considered a binary ionic compound because sodium is metal and nitrogen is non-metal. Hope this answers your question.
1. Oppositely charged ions attract.
2. Na3N.
3. Potassium and iodine.
4. Solid.