# Question #2d104

Nov 11, 2016

#### Answer:

$\text{MgBr"_2}$ is neither a metal nor a nonmetal. It is an ionic compound composed of the metal magnesium and the nonmetal bromine.

#### Explanation:

It is neither a metal nor a nonmetal. Magnesium bromide, $\text{MgBr"_2}$, is an ionic compound containing the metal magnesium (Mg) and the nonmetal bromine (Br). $\text{MgBr"_2}$ is the formula unit for the compound, which means that the subscripts give the lowest whole number ratio of magnesium and bromide ions in the compound, which is $\text{1Mg":"2Br}$. There are no molecules of $\text{MgBr"_2}$.

Ionic compounds are crystalline in nature, which is why we represent them as formula units instead of molecules. The following image is a representation of a portion of a sample of $\text{MgBr"_2}$.