Nuclear Radioactivity Vocab Crossword

5. the emission of energy as electromagnetic waves or as moving subatomic particles, especially high-energy particles which cause ionization.
6. The positively charged central core of an atom, consisting of protons and neutrons and containing nearly all its mass.
9. a material containing one or more unstable atoms (radionuclides) that spontaneously release energy in the form of ionizing radiation, such as alpha particles, beta particles, and gamma rays
11. the process where the nucleus of a heavy atom, such as uranium, splits into two or more smaller nuclei, along with neutrons and a significant amount of energy
12. The smallest part of a substance that cannot be broken down chemically

1. a form of energy released from the core of atoms, either by nuclear fission, where an atom's nucleus splits, or by nuclear fusion, where two nuclei join together
2. a chemical reaction or other process in which the products themselves promote or spread the reaction, which under certain conditions may accelerate dramatically.
3. the extremely dense, tiny, positively charged core of an atom that contains almost all of the atom's mass
4. the process by which the nucleus of an unstable atom spontaneously loses energy by emitting radiation, transforming into a more stable atom or isotope over time
6. a process where two light atomic nuclei combine to form a single, heavier nucleus, releasing a massive amount of energy in the process
7. the time required for half of a given quantity of a substance to decay or be eliminated through a process
8. radioactive material leftover from activities such as nuclear power generation, nuclear weapons production, medical procedures, and industrial uses
10. each of two or more forms of the same element that contain equal numbers of protons but different numbers of neutrons in their nuclei, and hence differ in relative atomic mass but not in chemical properties; in particular, a radioactive form of an element.