Across
- 1. positively charged central core of an atom, with protons and neutrons, nearly all of the mass
- 4. the amount of time it takes a substance to decay by half
- 7. nuclear reaction when a heavy nucleus splits randomly or collides with another particle, with a release of energy
- 8. fast moving electron emitted by radioactive decay of certain substances
- 9. stable subatomic particle in all nuclei with a positive electric charge
- 11. subatomic particle with a neutral charge and a mass almost equal to the protons
- 13. helium nucleus emitted by radioactive substances
- 14. number of protons in the nucleus, determines the place in the periodic table
Down
- 2. a chemical reaction or other process in which the products promote/spread the reaction, which may create the situation to increase drastically
- 3. the total number of protons and neutrons in the nucleus
- 5. process when two light atomic nuclei fuse together to combine a single heavy one, releasing lots of energy
- 6. an atom with the same number of protons but a different number of neutrons
- 10. emission of ionizing radiation or particles caused by spontaneous break up of atomic nuclei
- 12. form of electromagnetic radiation, most dangerous