1. The smallest particle of an element which can take part in chemical reactions and may or may not exist independently is the   nucleus   atom   compound   neutron   Hint Half-n-half Clue   2. The volume of the nucleus as compared to the volume of the atom is   25%   75%   50%   Negligible   Half-n-half Clue   3. The alpha particle scattering experiment was carried out by   E. Goldstein   J. J. Thomson   E. Rutherford   J. Chadwick   Half-n-half Clue   4. The three fundamental particles of the atom are   Positron, Neutrino and Gamma Rays   Mesons, Quarks and Anti-neutrino   Nucleus, Anti-quarks and Electrons   Proton, Neutron and Electron   Half-n-half Clue   5. Protons are   neutral particles with mass.   positively-charged particles with mass.   negatively-charged particles with negligible mass.   positively-charged particles with negligible mass.   Half-n-half Clue   6. The sum of the numbers of the protons and neutrons in the atom of an element is known as   Molecular Weight   Isotope Number   Mass Number   Atomic Number   Half-n-half Clue   7. Electrons are   positively-charged particles with negligible mass.   negatively-charged particles with mass.   positively-charged particles with mass.   negatively-charged particles with negligible mass.   Half-n-half Clue