Nuclear Energy

3. the number of protons in the nucleus of an atom, which determines the chemical properties of an element and its place in the periodic table.
6. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
7. a helium nucleus emitted by some radioactive substances, originally regarded as a ray.
8. the total number of protons and neutrons in a nucleus.
12. a subatomic particle of about the same mass as a proton but without an electric charge, present in all atomic nuclei except those of ordinary hydrogen.
13. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
14. a chemical reaction or other process in which the products themselves promote or spread the reaction, which under certain conditions may accelerate dramatically.

1. gamma rays.
2. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
4. a fast-moving electron emitted by radioactive decay of substances. (The emission of beta particles was originally regarded as a ray.).
5. the time taken for the radioactivity of a specified isotope to fall to half its original value.
9. is the central and most important part of an object, movement, or group, forming the basis for its activity and growth.
10. a stable subatomic particle occurring in all atomic nuclei, with a positive electric charge equal in magnitude to that of an electron, but of the opposite sign.
11. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.