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The smallest neutral part of an element that can take part in chemical reactions.
Particle consisting of two or more atoms joined together by covalent bonding.
Attractive forces
The weak forces of attraction between molecules.
States of matter
The three different forms that a substance can have: solid, liquid or gas.
Physical change
A change in which no new substances are formed - like changes of state.
Particle model
A theory to explain the different properties and observations of solids, liquids and gases.
Boiling point
The temperature at which a liquid boils.
Melting point
Temperature at which a substance changes from the solid state to the liquid state when heated; or from the liquid state to the solid state when cooled.
Chemical properties
How a substance reacts with other substances.