Here's why:
* Potassium is a metal with the symbol K.
* Bromine is a halogen with the symbol Br.
* When metals and halogens react, they form ionic compounds.
* Potassium has a +1 charge (K+) and bromine has a -1 charge (Br-).
* To balance the charges, one potassium ion combines with one bromide ion, resulting in the formula KBr.
