What is the center of an atom called?, Nucleus, Electron, Orbit, Ion, Which particle has a negative charge?, Proton, Nucleus, Electron, Neutron, Which particle has a positive charge?, Atom, Neutron, Electron, Proton, Which particle has no charge?, Electron, Neutron, Ion, Proton, What element has atomic number 1?, Oxygen, Carbon, Helium, Hydrogen, Where are electrons found?, Electron cloud, Nucleus, Core shell, Proton ring, Atoms of the same element have the same number of what?, Shells, Protons, Electrons, Neutrons, What is the atomic number?, Mass total, Electron shell, Proton count, Neutron count, What is the mass number?, Neutrons electrons, Electron total, Protons neutrons, Protons electrons, A charged atom is called what?, Ion, Compound, Isotope, Molecule

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