1. The particle discovered as a result of cathode ray experiments is the   proton   neutron   nucleus   electron   Hint Half-n-half Clue   2. Atoms of an element with the same number of protons but different number of neutrons in the nucleus are known as   Isosters   Twin Atoms   Isotopes   Isobars   Half-n-half Clue   3. The volume of the nucleus as compared to the volume of the atom is   75%   25%   50%   Negligible   Half-n-half Clue   4. The charge on the electron was discovered by   Fermi   Faraday   Mullikan   J. J. Thomson   Half-n-half Clue   5. The sum of the numbers of the protons and neutrons in the atom of an element is known as   Molecular Weight   Mass Number   Isotope Number   Atomic Number   Half-n-half Clue   6. The Atomic Theory was given by   E. Rutherford   J. J. Thomson   James Chadwick   John Dalton   Half-n-half Clue   7. The average mass of an atom of an element is known as   Molecular Weight   Atomic Number   Atomic Mass   Isotope   Half-n-half Clue