The (blank) state is the lowest possible energy level that an electron can occupy. When the electron gains energy, it may move to a higher energy level. This is called the (blank) state.

Two solids are mixed in a flask and stirred. after a few minutes, the flask becomes cold. which of the following best describes this reaction? a. an exothermic reaction b. a combustion reaction c. an endothermic reaction d. a decomposition reaction