The smallest unit of an element is:, A) Molecule, B) Atom, C) Cell, D) Compound, Which particle has a positive charge?, A) Electron, B) Neutron, C) Proton, D) Photon, Which particle has no charge?, A) Proton, B) Electron, C) Neutron, D) Ion, Electrons are found:, A) Inside the nucleus, B) Around the nucleus, C) Outside the atom, D) In the proton, The nucleus contains:, A) Electrons only, B) Protons only, C) Protons and neutrons, D) Neutrons and electrons, Atomic number is equal to the number of:, A) Neutrons, B) Electrons, C) Protons, D) Shells, Mass number is the sum of:, A) Protons and electrons, B) Protons and neutrons, C) Electrons and neutrons, D) Shells and electrons, Who discovered the electron?, A) Ernest Rutherford, B) J. J. Thomson, C) Niels Bohr, D) John Dalton

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