Nuclear energy

3. the central and most important part of an object
6. a helium nucleus emitted by some radioactive substances
8. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei
10. number is the number of protons in the nucleus of an atom
11. interval of time required for one-half of the atomic nuclei of a radioactive sample to decay
12. a subatomic particle of about the same mass as a proton but without an electric charge
13. a series of events so related to each other that each one initiates the next

1. The mass number also called atomic mass number or nucleon number, is the total number of protons and neutrons
2. this is a partical for which the mass number will not change but the atomic number increases by one
3. a nuclear reaction in which a heavy nucleus splits spontaneously
4. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
5. Gamma rays are a form of electromagnetic radiation
7. Nuclear fusion is the process by which two light atomic nuclei combine to form a single heavier one while releasing massive amounts of energy.
9. a stable subatomic particle occurring in all atomic nuclei