1. Isotopes have similar chemical properties.   True   False   2. Of a proton, neutron and an electron, the electron is the lightest.   True   False   3. Electrons are present in the nucleus.   True   False   4. The number of electrons in a neutral atom is equal to its atomic number.   True   False   5. Isotopes have same atomic number.   True   False   6. One atom of carbon and two atoms of oxygen combine to form a molecule of carbon dioxide [CO2].   True   False   7. In a neutral atom, the number of electrons and protons is equal.   True   False