Across
- 2. number of protons in the nucleus
- 6. rearrangement of DNA when hit by radiation
- 8. smallest particle of an element
- 9. determines which chemical element it is
- 11. circles around the nucleus
- 12. amount of time it takes for half of a radioactive element to transform something else
- 14. consist of two protons and two neutrons
- 17. measured in rems
- 19. referring to the particles that make up the nucleus
- 20. atom or group of atoms that has a positive or negative charge
- 21. atoms of the same element with different numbers of neutrons
Down
- 1. two smaller nuclei combine to form a larger nucleus
- 3. a subatomic particle with no charge
- 4. high speed electron emitted by the radioactive decay of an atomic nucleus
- 5. have no mass and no electric charge
- 7. composed of protons and neutrons
- 10. unstable atomic nucleus loses energy by radiation
- 13. number of protons and neutrons in the nucleus of an atom
- 15. simplest form of matter that has a unique set of properties
- 16. splits into two smaller nuclei buy a neutron
- 18. positively charged central core of an atom