Across
- 3. The spontaneous process of nuclei undergoing a change by the emitting particles or rays
- 7. Given under its symbol in the periodic table
- 8. Electrically neutral particles
- 11. Negatively charged subatomic particles
- 12. An isotope that undergoes spontaneous decay (disintegration)
- 13. Occurs when each fission event causes at least one or more fission events
- 14. Found inside the nucleus of an atom
- 17. The minimum amount of fissionable material necessary to sustain a chain reaction
- 18. The central core of an atom
- 20. The weighed average mass of an atom of the element in naturally occurring samples
- 21. The number of protons in the nucleus of an atom
- 22. In isotopic notation, symbolized by the letter Z
- 23. The short-range force of attraction that acts between two nucleons and holds the nucleus together
Down
- 1. A collective term for neutrons and protons
- 2. The total number of nucleons
- 4. Forms of nuclei of an element that have the same numbers of protons but differ in their numbers of neutrons
- 5. A procedure used to establish the age of ancient organic remains by measuring the amount of 14C in a sample
- 6. Particles coming from the nucleus that are not certain to be fundamental
- 9. The decrease in mass in a nuclear reaction
- 10. A substance in which all the atoms have the same number of protons
- 15. The number of protons plus neutrons in a nucleus
- 16. A high-temperature gas of free electrons and positively charged ions
- 19. The time it takes for half the nuclei in a given radioactive sample to decay