Using the periodic table and your knowledge of atomic structure. compare the number of electrons in a carbon-12 and carbon-14 isotope. a) both have 6 electrons. b) carbon-12 has 6 electrons and carbon-14 has 8 electrons. c) carbon-12 has no electrons and carbon-14 has 2 electrons. d) carbon-12 has 12 electrons and carbon-14 has 14 electrons.