A proton is approxomately (a) 200 times larger than electron (b) 2000 times larger than electron (c) 200 times smaller than electron (d) 2000 times smaller than electron (27) which are isotopes? An atom that has an atomic number of 34 and a mass isotope of an atom that has (a) an atomic number of 32 and a mass number of 76 (b) an atomic number of 34 and a mass number of 80 (c) 42 neutron and 34 protons (d) 42 protons and 34 neutrons