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CHEM 110 4/17/24 duration 48 minutes 31 seconds CHEM 110 4/17/24 CHEM 110 4/17/24	CHEM 110 4/17/24 Nuclear fission: chain reactions, critical mass, and World War II uranium neutrons reaction neutron mass bomb war plutonium chain energy lot element nuclei discovery fusion fission atoms target weapons From Katharine Tibbetts 2 plays 0