1. The charge on the electron was discovered by   Faraday   Mullikan   Fermi   J. J. Thomson   Hint Half-n-half Clue   2. The average mass of an atom of an element is known as   Atomic Number   Molecular Weight   Isotope   Atomic Mass   Half-n-half Clue   3. The number of protons present in the atom of an element is known as the   Atomic Number   Mass Number   Atomic Weight   Proton Number   Half-n-half Clue   4. Anode rays were discovered by   J. Chadwick   E. Rutherford   J. J. Thomson   E. Goldstein   Half-n-half Clue   5. The smallest particle of an element which can take part in chemical reactions and may or may not exist independently is the   neutron   compound   atom   nucleus   Half-n-half Clue   6. According to Rutherford, the atom consists of the following two parts   Neutrons and Electrons   Nucleus and the extra-nuclear part   Protons and Neutrons   Electrons and Protons   Half-n-half Clue   7. The sum of the numbers of the protons and neutrons in the atom of an element is known as   Isotope Number   Molecular Weight   Atomic Number   Mass Number   Half-n-half Clue