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