Proton - Sub-atomic particle with a positive charge, Electron - Sub-atomic particle with a negative charge, Neutron - Sub-atomic particle with no charge, Shells - Electrons are found on energy _________, Nucleus - Protons and neutrons are found in the ___________, Isotopes - Atoms of the same element that have different numbers of neutrons, Atom - The smallest part of an element that can exist. All substances are made of these., Element - Made up of only one type of atom. Found on the periodic table., Compound - Two or more elements chemically combined together., Mixture - Two or more elements or compounds not chemically combined together.,

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