Proton - The positively charged subatomic particle. It is located in the nucleus, Neutron - The neutrally charged subatomic particle. It is located in the nucleus, Electron - The negatively charged subatomic particle. It is not located in the nucleus, Nucleus - The dense center of an atom. It is responsible for the mass of an element., Electron Cloud - The location of all the electrons in an atom, It surrounds the nucleus., Valence Shell - The very last energy level of an atom. The electrons here determine how an atom will bond with any other atoms.,

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