Based on the electron configuration of the
two atoms, predict the ratio of magnesium to
bromine in the compound.

Magnesium 1s²2s²2p^6 3s²
Bromine 1s²2s²2p63s²3p64s²3d¹º4p5

A. 2:1
C. 1:1
B. 3:1
D. 1:2