Question

which statement is not a key point of the kinetic molecular theory (particle theory of matter)?

particles naturally repel one another.

matter is made of tiny particles.

the particles within matter are in constant motion.

the energy and distance between particles of matter determines the phase (state) of matter.

Explanation:

The kinetic molecular theory (particle theory of matter) has key points: matter is made of tiny particles, particles are in constant motion, and energy/distance between particles determines the phase. Particles don't naturally repel; intermolecular forces can be attractive or repulsive, but "naturally repel" isn't a key point.

Answer:

A. Particles naturally repel one another.