In what order are the common states of matter listed according to energy content?

The correct order of common states of matter according to energy content is solid, liquid, gas. In solids, the particles are closely packed in a fixed arrangement, which means they have the least amount of energy compared to the other states. As energy is added, solids can overcome some of their intermolecular forces, transitioning into the liquid state, where the particles are more loosely arranged and have more energy. Further increasing energy allows liquids to transition into gases, where the particles are widely spaced and can move freely, resulting in the highest energy state among the three.

This understanding of energy content relates to how matter transitions through phases, reflecting the principles of kinetic molecular theory. The arrangement and motion of particles in each state directly correlate to their energy — with solids having the least energy and gases the most.