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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
Note 
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