Nuclear energy

2. fusion the process by which two light atomic nuclei combine to form a single heavier one while releasing massive amounts of energy
3. reaction a chemical reaction or other process in which the products themselves promote or spread the reaction, which under certain conditions may accelerate dramatically.
6. fission atoms are split apart, which releases energy.
9. particle composite particles consisting of two protons and two neutrons tightly bound together
10. number the total number of protons and neutrons in a nucleus.
11. particle is a fast-moving electron emitted by radioactive decay of substances.
12. number 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.

1. 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.
2. A nucleus is a membrane-bound organelle that contains the cell's chromosomes.
4. The neutron is a subatomic particle, symbol n or n⁰ , which has a neutral charge, and a mass slightly greater than that of a proton.
5. the time taken for the radioactivity of a specified isotope to fall to half its original value.
7. the emission of ionizing radiation or particles caused by the spontaneous disintegration of atomic nuclei.
8. radiation Gamma rays are similar to x-rays, but are very penetrating and are best stopped or shielded by dense materials, such as lead or depleted uranium.
13. Atoms with the same number of protons but different numbers of neutrons are called isotopes.