Who discovered the electron?, a) J.J. Thomson, b) Rutherford, c) Chadwick, d) Bohr, The nucleus of an atom contains:, a) Only electrons, b) Protons and neutrons, c) Only protons, d) Protons and electrons, Which subatomic particle has a negative charge?, a) Proton, b) Electron, c) Neutron, d) Nucleus, The mass of an electron is approximately:, a) Equal to that of a proton, b) Equal to that of a neutron, c) 1/1836 of a proton, d) Double of a proton, What is the charge of a neutron?, a) Positive, b) Negative, c) Neutral, d) Depends on the atom, Which particle determines the atomic number of an element?, a) Neutron, b) Proton, c) Electron, d) Nucleus, The atom is mostly:, a) Empty space, b) Solid matter, c) Filled with electrons, d) Full of energy, If an atom has 6 protons and 6 neutrons, what is its mass number?, a) 6, b) 12, c) 18, d) 3, A certain atom has an atomic number of 11 and a mass number of 23. How many neutrons does it have?, a) 23, b) 12, c) 11, d) 34, Two atoms have the same number of protons but different numbers of neutrons. What are they called?, a) Ions, b) Molecules, c) Isotopes, d) Elements.

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