What is the correct formula for combining Mg2+ and Br1+

The correct formula is

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.  

Here magnesium is having an oxidation state of +2 called as cation and bromine is an anion with oxidation state of -1. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral .

The cations and anions being oppositely charged attract each other through strong coloumbic forces and form an ionic bond.

increased stability in the completion of fluorine's outer shell.

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.