Nuclear Chemistry

2. Positively charged particle in the nucleus
7. The time it takes for half the nuclei in a radioactive sample to decay
9. A particle consisting of 2 protons and 2 neutrons. Released during decay.
10. The presence of radioactive material in an undesired location
12. The center of the atom containing protons and neutrons
13. Energy emitted from a source in the form of particles or waves
15. Emergency Shutdown of a nuclear reactor
16. A reaction involving a change in an atom's nucleus, often producing a different element
18. The splitting of a heavy nucleus into lighter nuclei, releasing energy
20. The part of a nuclear reactor where the fission reaction takes place
21. Devices used in nuclear reactors to control the fission rate by absorbing neutrons
23. Negatively charged particle orbiting the nucleus
24. Neutrally charged particle in the nucleus
25. The process by which an unstable atomic nucleus loses energy by radiation

1. A self-sustaining reaction where the products trigger further reactions
3. High-energy electromagnetic Radiation released from a nucleus
4. A high-speed electron emitted when a neutron turns into a proton
5. Another isotope used as nuclear fuel for fission reactions
6. A commonly used fuel in fission reactions
8. Radioactive particles that fall to the ground after a nuclear explosion or accident
11. Atoms of the same element with different number of neutrons
14. An isotope with an unstable nucleus that undergoes radioactive decay
17. The smallest unit of matter
19. The combining of light nuclei to form a heavier nucleus, also releasing energy
22. The use of nuclear reactions to generate electricity