D. Electrons orbit in a fixed shell
Answer:
Explanation:
Endo and Exo thermic are defined by what changes take place in the environment of the reaction.
If the temperature goes up, the reaction is giving up heat. It is Exothermic.
If the temperature goes down, the reaction requires heat. It is Endothermic.
In this case, the temperature went down. The reaction is Endothermic.
<span>differences in the physical properties of the mixture's components</span>
1.An emotional strain and 2. a reaction to a complex emotional state.
