The substance Magnesium Bromide (MgBr2) would be classified as a

Magnesium Bromide (MgBr2) would be classified as an ionic compound.

Here's why:

1. Magnesium (Mg) is a metal from the 2nd group of the periodic table, and Bromine (Br) is a non-metal from the 17th group.

2. In ionic compounds, metals lose electrons to match the electron configuration of their nearest noble gas. Non-metals, on the other hand, gain electrons.

3. Magnesium loses two electrons to have the same electron configuration as Neon, and each Bromine atom gains one electron to have the same electron configuration as Krypton.

4. The transfer of electrons causes both Magnesium and Bromine to become ions. Magnesium becomes a positively charged ion (Mg2+), and Bromine becomes a negatively charged ion (Br-).

5. The opposite charges of the ions cause them to attract each other and form an ionic bond, creating the ionic compound Magnesium Bromide (MgBr2).