Here's a problem to solve: Magnesium bromide is one of the most abundant compounds found in sea water. Which formula correctly represents magnesium bromide?

Among the 4 following options, which is the correct answer?

- A: MgBr
 
- B: MgBr_{2}
 
- C: Mg_{2}Br
 
- D: Mg_{3}Br_{2}
 