Match these items.
1. first nuclear reactor 
Becquerel 
2. 
Fermi 
3. decaying nuclei 
mass-energy relationship 
4. 
neutron 
5. number of neutrons and protons 
atomic weight 
6. builds heavier elements 
curie 
7. discovered radioactivity 
negatively charged radioactive particle 
8. unit of radiation 
fusion 
9. E = mc 2 
fission