Final answer:
The gas phase contains the least force of attraction between particles, as gas particles have sufficient energy to overcome intermolecular forces and spread far apart, occupying the full volume of their container.
Step-by-step explanation:
The phase of matter with the least force of attraction between particles is the gas phase. In solids, the particles are closely packed together in an organized pattern, such as a lattice, with only vibrations around their fixed position. As a substance gains energy, for example from heat, the energetic state of its particles increases, allowing for more movement. In the liquid phase, particles have more energy compared to their solid state, enabling them to slide past each other, though they are still held together by mutual attraction. However, when a substance enters the gas phase, the particles possess enough energy to overcome intermolecular forces significantly, thus they spread far apart and move freely. The forces between these gas particles are very weak, and they will occupy the volume of their container fully.
There are various intermolecular forces at play in these phases, including dispersion forces, dipole-dipole interactions, and hydrogen bonding, but in gases, the intermolecular forces are not strong enough to hold the particles close together, making it the phase with the least force of attraction between particles.