What are the internal factors that decide the physical state of the substance?

PLACEHOLDER ANSWER - the answer is a description of factors. The physical state depends on the balance between the intermolecular forces of attraction holding the particles together and the thermal energy of the particles that tends to separate them. The internal factors are the nature and strength of the intermolecular forces, which depend on the size, mass, shape and polarity of the particles. Strong forces give solids, moderate forces give liquids, and weak forces give gases.