Radioactivity

1. An electron released by a radioactive nucleus that causes a neutron to change into a proton
4. The mass of an Alpha particle
6. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei
9. Protons and neutrons in the nucleus
11. Defect/ The difference between the actual mass from the predicted mass
13. An alpha particle is actually a nucleus of ____
16. The ______ mass of a reaction is the amount of fissionable material to make each reaction produce one more
18. Device or furnace where controlled fission chain reaction is carried out
19. Elements with an atomic number over 84
21. A positively charged particle made up of two protons and two neutrons and released by a radioactive nucleus
22. Stops Gamma rays
23. Unit of energy
24. Element discovered by the Curies
26. A process in nuclear physics in which the nucleus of an atom splits into two or more smaller nuclei as fission products, and usually some by-product particles
27. Iron and nickel nuclei have the largest binding energies per nucleon of all nuclei and therefore are the most ____

2. Beta particles are also ______
3. Coined the term "Radioactivity"
5. E=mc2 was discovered by ______
6. Father of Nuclear Physics
7. the changing of an atom into another kind of atom that takes place during radioactive decay
8. Use of radioactive materials in medicine
10. Protons do not repel each other in the nucleus because of the ______ force
12. discovered Radioactivity
14. Only nuclei with __________ atomic numbers can undergo fission
15. The energy needed to remove an electron from an atom is called the _______ energy
17. High-energy electromagnetic radiation released by a radioactive nucleus are called _____
19. Another element discovered by the Curies
20. Same number of protons, but a different number of neutrons
25. Country where catastrophic nuclear accident occurred
26. The process by which multiple nuclei join together to form a heavier nucleus