Explain the property of velocity. name one substance with high velocity.

Velocity is defined as displacement over time. Could you have possible meant viscosity? If so, viscosity is defined as the state of being thick, sticky, and semifluid in consistency, due to internal friction. And example of a substance with a high viscosity would be honey.

Matter- occupies space and possesses rest massno matter is the opposite

Both models are effective because they show the valence electrons, and these valence electrons indicate the reactivity of an element.