1. Isotopes have same atomic number.   True   False   2. Electrons revolve around the nucleus in shells or orbits.   True   False   3. An element is a substance made up of different kinds of atoms.   True   False   4. Isotopes have same atomic weight.   True   False   5. The number of electrons in a neutral atom is equal to its atomic number.   True   False   6. Since an atom of the element sodium contains 11 protons and 12 neutrons, its atomic number is 23.   True   False   7. In a neutral atom, the number of electrons and protons is equal.   True   False