What is the center of an atom called?, Orbit, Nucleus, Electron, Ion, Which particle has a positive charge?, Neutron, Electron, Photon, Proton, Which particle has no charge?, Neutron, Electron, Positron, Proton, Which particle has a negative charge?, Proton, Neutron, Electron, Nucleus, Where are electrons found?, Neutron shell, Electron cloud, Nucleus, Proton core, What determines an element’s identity?, Shell count, Electron mass, Proton number, Neutron number, What is the atomic number?, Shell count, Mass count, Neutron count, Proton count, What is the mass number?, Protons plus neutrons, Electrons only, Neutrons plus electrons, Protons plus electrons, Atoms of the same element with different neutron numbers are called?, Compounds, Isotopes, Ions, Molecules, An atom that gains or loses electrons becomes a?, Molecule, Mixture, Ion, Isotope, What is the charge of a neutral atom?, Variable, Negative one, Positive one, Zero, Most of an atom’s mass is in the?, Nucleus, Outer shell, Electron cloud, Valence level, Who proposed the nuclear model of the atom?, Thomson, Rutherford, Dalton, Bohr, Who discovered the electron?, Thomson, Bohr, Chadwick, Rutherford, Who discovered the neutron?, Thomson, Bohr, Dalton, Chadwick, What model shows electrons in energy levels?, Plum pudding, Solid sphere, Bohr model, Nuclear only, What are the outermost electrons called?, Inner protons, Valence electrons, Mass electrons, Core neutrons, Which shell fills first in an atom?, First shell, Second shell, Outer shell, Third shell, What do electrons occupy around the nucleus?, Mass layers, Charge zones, Proton rings, Energy levels, What is the symbol for an electron’s relative charge?, 0, +2, -1, +1

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