Br is the symbol for the element bromine. It is found in new IUPAC group 17 of a modern periodic table. Bromine is a halogen.
To name a halogen anion with charge -1, replace the suffix "-ine" in the name of the element with the suffix "-ide." For example,
[tex]\displaystyle \begin{array}{lcl} \text{Element}& & \text{Ion}\\ \text{Brom}\textbf{ine} &\to& \text{Brom}\textbf{ide}\text{ ion} \\\text{Chlor}\textbf{ine} &\to & \text{Chlor}\textbf{ide}\text{ ion}\\\text{Fluor}\textbf{ide}& \to & \text{Fluor}\textbf{ide}\text{ ion}\end{array}[/tex]
The symbol of a bromine atom is Br. The atom is neutral. However, it carries a negative charge of -1 after it gains one electrons and forms a negative ion. The charge of the bromide ion shall be written as a superscript in its symbol. The size of the charge is written in front of the sign.
The charge on the bromide ion is -1. In the superscript, omit the number 1 and write "-". Hence the symbol
[tex]\text{Br}^{-}[/tex].
