The nucleus of an atom consists of neutrons and protons (no electrons). A nucleus of a carbon-12 isotope contains six neutrons and six protons, while a nitrogen-14 nucleus comprises seven neutrons and seven protons. You perform a nuclear physics experiment in which you bombard nitrogen-14 nuclei with very high speed carbon-12 nuclei emerging from a particle accelerator. As a result of each such collision, the two nuclei disintegrate completely and a mix of dissimilar particles are emitted, including electrons, antiprotons, protons (with electric charge –e each), positrons (with charge e each), and various neutral particles (including neutrons and neutrinos). For a particular collision you detect the emitted products and find sixteen protons, three antiprotons, nine positrons, and twenty-six neutral particles. How many electrons are also emitted?