# Chapter 2 - Atoms, Molecules, and Ions - Exercises: 2.73e

$HgBr_2$

#### Work Step by Step

Mercury can have a variety of different charges. However, the textbook specifies that it is Mercury (II). The (II) indicates that this Mercury ion has a charge of 2+. Bromine is located one group to the left of the noble gases, meaning that it has a charge of 1-. In order for the charges of the ions to cancel each other out, there must be two Bromine ions for every one Mercury ion. Because metals come before non-metals in chemical formulas, the chemical formula for Mercury (II) Bromide is $HgBr_2$.

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