Final answer:
The correct formula for the compound formed between beryllium and nitrogen is Be3N2.
Step-by-step explanation:
The correct formula for the compound formed between beryllium and nitrogen is Be3N2. Beryllium (Be) has a valency of +2, and nitrogen (N) has a valency of -3. To balance the charges, we need two beryllium atoms, each donating two electrons, and three nitrogen atoms, each accepting two electrons. This gives us Be3N2.