13. Determining whether the formation of an ionic compound is endothermic or exothermic reaction requires analyzing the individual steps that must occur for the reaction to take place. Which of the following steps is not necessary to combine barium and chlorine into the compound barium chloride?
Ba() + Cl2 → BaCl2
O Barium must be lonized.
O Chlorine must be lonized.
The compound must be separated into lons.
Ions combine to form compound.