Periodic Table - The______ is a chart that lists all known elements., Inside - Protons are located _______ the nucleus., Element - A chemical substance that cannot be broken down into a simpler substance and keep the same properties. , Nucleus - The center of an atom., Electron Cloud - The area in an atom with the least amount of mass., Mass - Protons + neutrons = ___________?, Outside - Electrons are located ________ of the nucleus. , Neutron - Has a neutral charge., Atom - The basic unit of a chemical element. ,

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