Which of the following best describes what happens when molecular compounds melt? a.) molecules separate into their component atoms. b.)molecules move more slowly. c.) molecules arranged in an irregular pattern change to a regular pattern. d.) molecules arranged in a regular pattern change to an irregular patter.

Which of the following statements is true about energy quantization at the atomic level? electrons in the outermost orbits are the most stable. electrons in all the orbits around the nucleus have the same amount of energy. electrons in the orbit closest to the nucleus have the least amount of energy. electrons absorb or release the same amount of energy independent of the energy levels.