Nuclear Power

4. a nuclear reaction in which atoms are split into smaller parts
6. a negatively charged subatomic particle
7. the self-sustaining reaction spread by neutrons which occurs in nuclear reactors
11. the smallest particle of a substance that can exist by itself
12. chemical element Pu
14. a species of atoms having the same number of protons
15. having or producing a powerful and dangerous form of energy called radiation
16. element He, involved in nuclear fusion
18. a type of nuclear fuel that contains more of the radioactive isotope
19. they are present in every atom and contain the protons and neutrons
20. relating to the nucleus of an atom

1. an important number for an atom, that can be estimated by adding the number of protons and neutrons
2. a positively charged subatomic particle
3. element H, used in nuclear fusion
5. atoms of elements with different numbers of neutrons
8. a neutral subatomic particle
9. refers to the number of protons an atom has (e.g. 6 for C)
10. a nuclear reaction in which a nucleus is merged with another one
13. a type of nuclear fuel that contains less of the radioactive isotope
17. chemical element U