Atom - the smallest particle of an element that still has the element's properties, Neutrons - This subatmic particle contributes to the overall mass of an atom but not its charge, Electrons - the subatomic particle located in the space surrounding the nucleus, Quarks - the smallest known particles that male up both protons and neutrons, Protons - this subatomic particle is what gives the nucleus an overall positive charge, Electron Cloud - the space surrounding the nucleus that has an overall negative charge, Nucleus - the dense center of an atom, Shells - also known as energy level, these break up the region of space surrounding the nucleus, Valence Electrons - located in the outermost energy level of the electron cloud, with the most energy. ,

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