By: Krystal & Sofia
BeBr2 = Beryllium Bromide
Be (Beryllium has a +2 charge because it is two away from the noble gases, and since it is the first ion, it is always positive
Br has a -1 charge because it is one away from the noble gas and since it is the second ion, it is always negative.
Since Be has a postive 2 charge, you need two of Br to make a -2 charge to match Be. Since that is needed, you need to write BeBr and add a 2 after Br to show that there is two Br's. Once that is done, they are neutral charge, becoming one.
That is how BeBr2 is formed.