Atom - The basic building block of all matter. Mostly made up of empty space., Molecule - A group of two or more atoms bonded together., Compound - Created when the atoms of two or more chemical elements bond together., Element - A chemical substance that cannot be broken down into other substances., Proton - A subatomic particle found in the atomic nuclei, with a positive electric charge., Neutron - A subatomic particle with about the same mass as a proton, fount in the atomic nuclei, without a electric charge., Electron - A subatomic particle with a negative charge., Valence shell - The outermost shell of every element.,

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