atom, The smallest unit of matter, nucleus, The middle part of an atom. (protons and neutrons), molecule, Two or more atoms stuck together., element, A pure material made of one kind of atom., compound, When two or more elements chemically join, substance, Any kind of material or matter., chemistry, The study of substances and how they react, reaction, When things mix and change into something new., electron, Particles around the nucleus , rust, The orange-brown stuff formed when iron reacting with oxygen.

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