Nuclear energy

4. gamma rays.
8. the time taken for the radioactivity of a specified isotope to fall to half its original value.
9. a stable subatomic particle occurring in all atomic nuclei with a positive charge.
10. a nuclear reaction in which a heavy nucleus splits spontaneously or on impact with another particle, with the release of energy.
12. the number of protons in the nucleus of an atom
13. a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy.

1. a helium nucleus emitted by alpha decay
2. the emission of ionizing radiation or particles.
3. a fast-moving electron emitted by radioactive decay of substances
5. the positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
6. the total number of protons and neutrons in a nucleus.
7. 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.
11. 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. series of chemical reactions where the products of the reaction contribute to the reactants of another reaction.