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,
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
As the temperature of a solvent increases, the solubility of any gas dissolved in that solvent decreases.
when the temperature of a river, lake or stream is raised high , due to discharge of hot water from some industrial process the solubility of the oxygen in the water is decreased .The fish and the other organisms that live in the water bodies such as rivers, ponds, lakes etc can survive only in the presence of oxygen and decrease in the concentration of the water due to increased temperature can lead to the death of the fish and this may in turn damage the ecosystem.
In the above example, water is considered as the solvent and the oxygen is considered as the solute. When the temperature of the solvent that is water increases, the solubility of the gas that is oxygen in the solvent decreases.
Therefore the answer is decreases.