The isotope of lithium used in a hydrogen bomb is Li-6, whose nucleus contains 3 protons and 3 neutrons. When a Li-6 nucleus absorbs a neutron, a nucleus of the heaviest hydrogen isotope, tritium (H-3), is produced. Using the same nomenclature as used here for the isotopes, the other product of the reaction (other than H-3) when a Li-6 nucleus absorbs a neutron is . The product of this reaction that fuels the nuclear explosive reaction is