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| 1 | The process of binding smaller atomic nuclei into a single larger and more stable nucleus | 
 
 
| 2 | Radiation that is made up of beta particles | 
 
 
| 3 | Isotopes of atoms that have unstable nuclei and emit radiation to attain more stable atomic configurations | 
 
 
| 4 | A particle that has the same mass as an electron but an opposite charge | 
 
 
| 5 | High-energy radiation that has no electrical charge and no mass, is not deflected by electric or magnetic fields | 
 
 
| 6 | A particle with two protons and two neutrons with a 2+ charge | 
 
 
| 7 | The process in which nuclei are bombarded with high-velocity charged particles in order to create new elements | 
 
 
| 9 | The time required for one-half of a radioisotope's nuclei to decay into its products | 
 
 
| 16 | A form of high-energy, penetrating electromagnetic radiation emitted from some materials that are in an excited electron state | 
 
 
| 17 | A high-speed electron with a 1- charge that is emitted during radioactive decay | 
 
 
| 19 | The positively charged protons and neutral neutrons contained in an atom's densely packed nucleus | 
 
 
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