Question

What subscripts are needed to complete the formula unit Li_N_?

Answer 1

Answer:

3,1

Explanation:

Lithium nitride is a ionic compound. The lithium cation is Li⁺ and the nitride anion is N³⁻

When writing the ionic compounds formed by the respective ions the general rule is to write the charge of the anion as the subscript of the cation and to write the charge of the cation as the subscript of the anion.  

Li⁺ N³⁻  

Li₃N₁

Li₃N

Answer 2

The Answer would be B.)3,1 
Lithium nitride is the chemical compound 
The formula would look like this: Li3N