1. According to Rutherford, the atom consists of the following two parts   Electrons and Protons   Neutrons and Electrons   Nucleus and the extra-nuclear part   Protons and Neutrons   Hint Half-n-half Clue   2. The volume of the nucleus as compared to the volume of the atom is   25%   50%   Negligible   75%   Half-n-half Clue   3. The number of protons present in the atom of an element is known as the   Mass Number   Proton Number   Atomic Number   Atomic Weight   Half-n-half Clue   4. According to Rutherford,   the neutrons revolve around the nucleus.   the nucleus revolves around the electrons.   the electrons revolve around the nucleus.   the protons revolves around the nucleus.   Half-n-half Clue   5. The sum of the numbers of the protons and neutrons in the atom of an element is known as   Isotope Number   Atomic Number   Molecular Weight   Mass Number   Half-n-half Clue   6. The average mass of an atom of an element is known as   Atomic Mass   Atomic Number   Isotope   Molecular Weight   Half-n-half Clue   7. Atoms of an element with the same number of protons but different number of neutrons in the nucleus are known as   Isotopes   Twin Atoms   Isosters   Isobars   Half-n-half Clue