<span>1. first nuclear reactor </span>Fermi - an italian physicist who made the first nuclear reactor<span> 2. </span>1/0 η<span> </span>atomic mass <span> 3. decaying nuclei </span>fission<span> - nuclear reaction from a heavy elements to lighter elements 4. number of neutrons and protons </span>neutron <span> 5. builds heavier elements </span>fusion - nuclear reaction from two or more elements to a heavier element<span> 6. discovered radioactivity </span>Curie<span> 7. unit of radiation </span> Becquerel
