Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br. Chemistry Use Lewis theory to determine the chemical formula for the compound formed between Mg and Br. A) MgBr B) Mg2Br3 C) Mg3Br2 D) MgBr2 E) Mg2Br Answer: D Learn More : Share this Share on FacebookTweet on TwitterPlus on Google+