Atom  - smallest particle of an element. Atoms have a nucleus containing protons and (usually) neutrons, surrounded by electrons, Chemical Change - change that produces new substances, Chemical Reaction  - process in which substances react to form different substances, Electrostatic Forces - forces of attraction or repulsion between electrically charged particles, Matter - anything that has mass, Model  - description, analogy, or equation that helps you to explain the physical world, Particle - tiny piece of matter, such as an atom, ion, or molecule, Particle Model - scientific idea used to explain the properties of solids, liquids, and gases, Physical Change - change, such as changes in state, that does not result in new substances being made, State - the form that a substance has (solid, liquid, or gas) under given conditions of temperature and pressure,

C1.1 The Particle Model

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