Question

what is the correct formula for barium nitride?

Explanation:

Step1: Determine the valency of ions

Barium (\(Ba\)) forms \(Ba^{2+}\) ion. Nitride (\(N\)) forms \(N^{3 -}\) ion.

Step2: Use the criss - cross method

To form a neutral compound, the charges must balance. Using the criss - cross method (swapping the absolute values of the charges as subscripts), we get \(Ba_3N_2\).

Answer:

B. \(Ba_3N_2\)