Nuclear Chemistry

2. protons plus neutrons
4. atoms with the same number of protons but different numbers of neutrons
6. a neutron turns into a proton and an electron
7. very high energy light
8. when the nucleus of an atom splits into two or more smaller nuclei
10. a reaction that changes the nucleus of an atom
12. Nuclear fission releases neutrons as products, which can trigger more fission reactions
13. either an electron or a positron
14. the number of protons in an atom
16. amount of time it takes for half the radioactive material to decay
17. particle with the same mass as an electron but positively charged
20. release of gamma radiation
21. release of an beta particle and energy

1. when two or more nuclei combine to form a larger nucleus
3. a helium nucleus, made of 2 protons and 2 neutrons
5. holds subatomic particles such as protons and neutrons together
9. used to absorb extra neutrons so that the fission reaction can be controlled
11. the time it takes for half of the original amount of a substance to undergo a change
15. a proton turns into a neutron and positron
18. the release of energy from an unstable nucleus
19. release of an alpha particle and energy