Valence electrons are... a) used to form bonds to make atoms more stable.

b) inner electrons that carry large amounts of energy.

C)found in the nucleus and contribute to the mass of an element.

D)can be predicted by looking at the atomic number.

Two liquids are poured into a beaker. after a few seconds, the beaker becomes warm. which of the following best describes this reaction? a. an exothermic reaction b. a decomposition reaction c. an endothermic reaction d. a single-displacement reaction