Nuclear chemistry

2. determines the chemical properties of an element and its place in the periodic table.
8. a nucleus undergoes spontaneous transformation into one or more different nuclei and simultaneously emits radiation
9. a distinct kind of atom or nucleus characterized by a specific number of protons and neutrons.
10. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
14. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of opposite sign.
17. a helium nucleus emitted by some radioactive substances originally regarded as a ray.
18. a proton or neutron.
19. the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
20. a stable subatomic particle with a charge of negative electricity

1. stability of elements determined by the ratio of the number of neutrons to the number of protons in the nucleus.
3. one of two or more species of atoms of a chemical element
4. a fast-moving electron emitted by radioactive decay of substances
5. a change in the identity or characteristics of an atomic nucleus that results when it is bombarded with an energetic particle, as in fission, fusion, or radioactive decay.
6. penetrating electromagnetic radiation of a kind arising from the radioactive decay of atomic nuclei.
7. any of a number of subatomic particles carrying a fractional electric charge, postulated as building blocks of the hadrons.
11. the mass of an atom of a chemical element expressed in atomic mass units.
12. an atom or molecule with a net electric charge due to the loss or gain of one or more electrons.
13. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.
15. the total number of protons and neutrons in a nucleus.
16. a subatomic particle of about the same mass as a proton but without an electric charge