Periodic Table, A chart that lists all known elements., Proton, Positively charged subatomic particle in 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 that has protons and neutrons, Electron Cloud, surrounds the nucleus of an atom and has the least mass, Atomic Mass, Protons + neutrons, Electron, Negatively charged subatomic particle with 1/2000th the mass of a proton, that is outside the nucleus of an atom, Neutron, Neutral charge subatomic particle, Atom, basic unit of a chemical element.

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