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. (gold; antimony, plutonium), 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 (negatively charged), rust - The orange-brown stuff formed when iron reacting with oxygen,

Chemistry

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